
62
CHAPTER 3 CPU
3.9.4
Restrictions on Prefix Codes
The following three restrictions are imposed on the use of prefix codes:
• Interrupt/hold requests are not accepted during the execution of prefix codes and
interrupt/hold suppression instructions.
• If a prefix code is placed before an interrupt/hold instruction, the effect of the prefix
code is delayed.
• If consecutively placed prefix codes conflict, the last prefix code is valid.
■
Prefix Codes and Interrupt/hold Suppression Instructions
Table 3.9-6 lists the interrupt/hold suppression instructions and prefix codes that have restrictions.
●
Interrupt/hold suppression
As shown in Figure 3.9-1, an interrupt or hold request generated during the execution of prefix codes and
interrupt/hold instructions is not accepted. The interrupt/hold is not processed until the first instruction that
is not governed by a prefix code or that is not an interrupt/hold suppression instruction is executed.
Figure 3.9-1 Interrupt/hold Suppression
Table 3.9-6 Prefix Codes and Interrupt/hold Suppression Instructions
Prefix codes
Interrupt/hold suppression instructions
(instructions that delay the effect of prefix codes)
Instructions that do not
accept interrupt and
hold requests
PCB
DTB
ADB
SPB
CMR
NCC
MOV ILM, #imm8
OR CCR, #imm8
AND CCR, #imm8
POPW PS
Interrupt/hold suppression instruction
↑
…………
(a)
……
↑
Interrupt request generated
Interrupt accepted
(a) Ordinary instruction
⎨
Summary of Contents for MB90460 Series
Page 1: ...The following document contains information on Cypress products ...
Page 3: ......
Page 5: ......
Page 9: ...iv ...
Page 41: ...22 CHAPTER 1 OVERVIEW ...
Page 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Page 83: ...64 CHAPTER 3 CPU ...
Page 95: ...76 CHAPTER 4 RESET ...
Page 107: ...88 CHAPTER 5 CLOCK ...
Page 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 175: ...156 CHAPTER 7 INTERRUPT ...
Page 181: ...162 CHAPTER 8 MODE SETTING ...
Page 223: ...204 CHAPTER 9 I O PORT ...
Page 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Page 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Page 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Page 485: ...466 CHAPTER 16 PWC Timer ...
Page 531: ...512 CHAPTER 17 UART ...
Page 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Page 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Page 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Page 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Page 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Page 715: ...696 APPENDIX ...
Page 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 739: ......