Fujitsu MB90895 Series Hardware Manual page 74

CHAPTER 3 CPU
G
Delay of the effect of the prefix code
When a prefix code precedes an interrupt inhibit instruction, it affects the next instruction after the interrupt
inhibit instruction.
MOV A,FF
H
CCR XXX10XX
I Array of Prefix Codes
For a succession of conflicting prefix codes (PCB, ADB, DTB, SPB) the last one is enabled.
56
Figure 3.4-2 Interrupt Inhibit Instruction and Prefix Code
NCC
MOV ILM,#imm8
B
Figure 3.4-3 Array of Prefix Codes
Prefix code
ADB DTB
Interrupt inhibit instruction
CCR remains unchanged by NCC.
PCB
ADD A,01
H
Prefix code enables PCB.
ADD A,01
H
CCR XXX10XX
B