8XC196Kx, Jx, CA USER’S MANUAL
Table 16-15. RISM Command Descriptions (Continued)
Value |
Command |
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Description |
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0AH |
DATA_TO_ADDR |
Puts the low word of the DATA register into the ADDR register. |
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ADDR |
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DATA |
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Before command |
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F1 |
05 |
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22 |
16 |
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After command |
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22 |
16 |
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F1 |
05 |
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22 |
16 |
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0BH |
INDIRECT |
Puts the word from the memory address pointed to by the ADDR register into the |
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ADDR register. |
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Memory Addr. |
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ADDR |
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2217 |
2216 |
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Before command |
22 |
16 |
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80 |
09 |
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After command |
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80 |
09 |
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80 |
09 |
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12H |
GO |
PUSHes the user PC, PSW, and WSR onto the stack and starts your program |
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from the location contained in the user PC. The RISM PC, PSW, and WSR will |
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also be in the stack, so allow enough room on the stack for all six words. Your |
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program must not directly alter memory locations 56H–5CH; the RISM uses these |
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locations if your program reads from or writes to any memory. |
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You can interrogate memory locations while your program is running. The RISM |
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interrupts your program to process the command, then returns execution to your |
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program. |
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13H |
HALT |
Stops executing your program, POPs the user PC, PSW, and WSR from the |
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stack, and PUSHes the RISM PC, PSW, and WSR back onto the stack. The RISM |
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PC contains the location of the Monitor_Pause routine, so the RISM returns to |
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Monitor_Pause. |
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14H |
REPORT |
Loads a value into the DATA register. This value indicates the status of your |
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program: |
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Value |
Status |
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00 |
halted |
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01 |
running |
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02trapped
16.10.6RISM Command Examples
This section provides examples of ways in which you might use the RISM commands.
16-38
PROGRAMMING THE NONVOLATILE MEMORY
16.10.6.1Example 1 — Programming the PPW
You should specify the programming pulse width before you do any programming or write to any memory locations. This example assumes an 87C196KT device. It loads the SP_PPW register (221CH/221DH) with 8010H, the minimum value for 16-MHz operation. (See “Programming Pulse Width” on page 16-8 to determine the correct PPW for other frequencies.)
Before this programming step takes place, the SP_PPW register contains its default value, 80FFH. The PPW is equal to 2.30 ms, so this program step will take 11.52 ms per word to complete (5 pulses of 2.30ms each). After the PPW value is changed, subsequent programming operations will take only 500 µs per word (5 pulses of 100 µs each).
Because an OTPROM location is being altered, VPP must be at +12.5 volts. RISM commands must be sent across the serial port one byte at a time, and a SET_DLE_FLAG command must precede any data byte that is less than 1FH. The address being modified must first be loaded into the DATA register, then transferred to the ADDR register.
Send |
Comments (Example 1) |
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DATA |
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ADDR |
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22 |
Data. High byte of address to DATA register. |
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22 |
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00 |
SET_DLE_FLAG. The next data byte is < 1FH. |
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22 |
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1C |
Data. Low byte of address to DATA register. |
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22 |
1C |
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0A |
DATA_TO_ADDR. Move address to ADDR. |
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22 |
1C |
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22 |
1C |
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80 |
Data. High byte of data to DATA register. |
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22 |
1C |
80 |
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22 |
1C |
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00 |
SET_DLE_FLAG. The next data byte is < 1FH. |
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22 |
1C |
80 |
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22 |
1C |
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10 |
Data. Low byte of data to DATA register. |
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1C |
80 |
10 |
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22 |
1C |
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08WRITE_WORD. Low word of DATA to memory location 221C (contents of ADDR). Increment ADDR by two.
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22 |
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1C |
80 |
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10 |
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22 |
1C |
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Memory Addresses |
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221D |
221C |
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80 |
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22 |
1E |
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Any write operation can be done in this manner.
16-39
PROGRAMMING THE NONVOLATILE MEMORY
Send |
Comments (Example 3) |
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DATA |
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ADDR |
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00 |
SET_DLE_FLAG. Next data byte is < 1FH. |
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04 |
Data. High byte of address 0400H. |
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04 |
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00 |
SET_DLE_FLAG. Next data byte is < 1FH. |
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04 |
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00 |
Data. Low byte of address 0400H. |
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04 |
00 |
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0A |
DATA_TO_ADDR. Move address to ADDR. |
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04 |
00 |
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04 |
00 |
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A1 |
Data. High byte of hex file for location 0401H. |
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04 |
00 |
A1 |
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04 |
00 |
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22 |
Data. Low byte of hex file for location 0400H. |
04 |
00 |
A1 |
22 |
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04 |
00 |
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08WRITE_WORD. Low word of DATA to memory location 0400 (contents of ADDR). Increment ADDR by two.
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04 |
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00 |
A1 |
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22 |
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04 |
00 |
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Memory Addresses |
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0401 |
0400 |
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A1 |
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04 |
02 |
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00 |
SET_DLE_FLAG. Next data byte is < 1FH. |
04 |
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00 |
A1 |
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22 |
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04 |
02 |
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11 |
Data. High byte of hex file for location 0403H. |
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A1 |
22 |
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11 |
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04 |
02 |
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00 |
SET_DLE_FLAG. Next data byte is < 1FH. |
00 |
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A1 |
22 |
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11 |
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04 |
02 |
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80 |
Data. Low byte of hex file for location 0402H. |
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A1 |
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22 |
11 |
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80 |
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04 |
02 |
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08WRITE_WORD. Low word of DATA to memory location 0402 (contents of ADDR). Increment ADDR by two.
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A1 |
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22 |
11 |
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80 |
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04 |
02 |
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Memory Addresses |
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0403 |
0402 |
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11 |
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80 |
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04 |
04 |
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16-41