Interrupt Disable Instructions - Fujitsu MB90390 Series Hardware Manual

2.10

Interrupt Disable Instructions

Interrupt requests are not sampled for the following ten instructions:
- MOV ILM,#imm8
- AND CCR,#imm8 - ADB
■ Interrupt Disable Instructions
If a valid interrupt request occurs during execution of any of the above instructions, the interrupt can be
processed only when an instruction other than the above is executed. For details, see Figure 2.10-1.
■ Restrictions on Interrupt Disable Instructions and Prefix Instructions
When a prefix code is placed before an interrupt disable instruction, the prefix code affects the first
instruction after the code other than the interrupt disable instruction. For details, see Figure 2.10-2.
MOV A, FFH
CCR:XXX10XX
B
- PCB - SPB
- CMR
Figure 2.10-1 Interrupt Disable Instruction
Interrupt disable instruction
• • • • • • • • • • •
Interrupt request
Figure 2.10-2 Interrupt Disable Instructions and Prefix Codes
Interrupt disable instruction
NCC MOV ILM,#imm8
- OR CCR,#imm8
- POPW PS
(a)
Interrupt acceptance
• • • •
CCR does not change with NCC.
CHAPTER 2 CPU
- NCC
- DTB
(a) Ordinary
instruction
ADD A,01H
CCR:XXX10XX
B
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