upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 295

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

14.4.4 Interrupt request hold
executed, request acknowledgment is held pending until the end of execution of the next instruction.
instructions (interrupt request hold instructions) are listed below.
CPU processing
There are instructions where, even if an interrupt request is issued for them while another instruction is being
Caution The BRK instruction is not one of the above-listed interrupt request hold instructions. However,
Figure 14-11 shows the timing at which interrupt requests are held pending.
Remarks 1. Instruction N: Interrupt request hold instruction
MOV PSW, #byte
MOV A, PSW
MOV PSW, A
MOV1 PSW. bit, CY
MOV1 CY, PSW. bit
AND1 CY, PSW. bit
OR1 CY, PSW. bit
XOR1 CY, PSW. bit
SET1 PSW. bit
CLR1 PSW. bit
RETB
RETI
PUSH PSW
POP PSW
BT PSW. bit, $addr16
BF PSW. bit, $addr16
BTCLR PSW. bit, $addr16
EI
DI
Manipulation instructions for the IF0L, IF0H, IF1L, MK0L, MK0H, MK1L, PR0L, PR0H, and PR1L registers
the software interrupt activated by executing the BRK instruction causes the IE flag to be cleared
to 0. Therefore, even if a maskable interrupt request is generated during execution of the BRK
instruction, the interrupt request is not acknowledged.
2. Instruction M: Instruction other than interrupt request hold instruction
3. The
IF
PR (priority level) values do not affect the operation of
Instruction N
Figure 14-11. Interrupt Request Hold
CHAPTER 14 INTERRUPT FUNCTIONS
User’s Manual U15836EJ5V0UD
Instruction M
PSW and PC saved, jump
to interrupt servicing
IF (interrupt request).
Interrupt servicing
program
These
295