Filter
Top Products
RL78/G1A CHAPTER 16 INTERRUPT FUNCTIONS
16.4.4 Interrupt request hold
There are instructions where, even if an interrupt request is issued while the instructions are being executed, interrupt
request acknowledgment is held pending until the end of execution of the next instruction. These instructions (interrupt
request hold instructions) are listed below.
• MOV PSW, #byte
• MOV PSW, A
• MOV1 PSW. bit, CY
• SET1 PSW. bit
• CLR1 PSW. bit
• RETB
• RETI
• POP PSW
• BTCLR PSW. bit, $addr20
• EI
• DI
• SKC
• SKNC
• SKZ
• SKNZ
• SKH
• SKNH
• Write instructions for the IF0L, IF0H, IF1L, IF1H, IF2L, IF2H, MK0L, MK0H, MK1L, MK1H, MK2L, MK2H, PR00L,
PR00H, PR01L, PR01H, PR02L, PR02H, PR10L, PR10H, PR11L, PR11H, PR12L, and PR12H registers
<R>
Figure 16-11 shows the timing at which interrupt requests are held pending.
Figure 16-11. Interrupt Request Hold
Instruction N Instruction M
PSW and PC saved, jump
to interrupt servicing
Interrupt servicing
program
CPU processing
××IF
Remarks 1. Instruction N: Interrupt request hold instruction
2. Instruction M: Instruction other than interrupt request hold instruction
R01UH0305EJ0200 Rev.2.00 713
Jul 04, 2013