Fujitsu MB90335 Series Hardware Manual page 62

MB90335 Series
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POPW PS
Either SSB or USB is used according to the S flag regardless of the prefix. The prefix affects the next
instruction.
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MOV ILM,#imm8
The instruction is executed normally, but the prefix affects the next instruction.
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RETI
SSB is used regardless of the prefix.
■ Common Register Bank Prefix (CMR)
To simplify data exchange between multiple tasks, the same register bank must be accessed regardless of
the RP value. When the common register bank prefix (CMR) is placed before an instruction that accesses
the register bank, that instruction accesses the common bank (the register bank selected when RP=0) at
addresses from 000180
care:
●
String instructions (MOVS / MOVSW / SCEQ / SCWEQ / FILS / FILSW)
If an interrupt request occurs during execution of a string instruction with a prefix code, the string
instruction is executed falsely because the prefix becomes invalid for the string instruction after the
interrupt is returned. Do not attach CMR prefix to any of the above string instructions.
●
Flag change instructions (AND CCR,#imm8 / OR CCR,#imm8 / POPW PS)
The instruction is executed normally, but the prefix affects the next instruction.
●
MOV ILM,#imm8
The instruction is executed normally, but the prefix affects the next instruction.
■ Flag Change Disable Prefix (NCC)
To disable a flag change, use the flag change disable prefix code (NCC). Placing NCC before an instruction
that disables an unwanted flag change can disable flag changes associated with that instruction. Use the
following instructions with care:
●
String instructions (MOVS / MOVSW / SCEQ / SCWEQ / FILS / FILSW)
If an interrupt request occurs during execution of a string instruction with a prefix code, the string
instruction is executed falsely because the prefix becomes invalid for the string instruction after the
interrupt is returned. Do not attach NCC prefix to any of the above string instructions.
●
Flag change instructions (AND CCR,#imm8 / OR CCR,#imm8 / POPW PS)
The instruction is executed normally, but the prefix affects the next instruction.
●
Interrupt instructions (INT #vct8 / INT9 / INT addr16 / INTP addr24 / RETI)
CCR changes according to the instruction specifications regardless of the prefix.
CM44-10137-6E
to 00018F regardless of the current RP value. Use the following instructions with
H H
FUJITSU MICROELECTRONICS LIMITED
CHAPTER 2 CPU
2.8 Prefix Codes
41