UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 742

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

19.4.4 Interrupt request hold
executed, request acknowledgement is held pending until the end of execution of the next instruction.
instructions (interrupt request hold instructions) are listed below.
740
CPU processing
There are instructions where, even if an interrupt request is issued for them while another instruction is being
Figure 19-11 shows the timing at which interrupt requests are held pending.
Remarks 1. Instruction N: Interrupt request hold instruction
Caution The BRK instruction is not one of the above-listed interrupt request hold instructions.
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, IF1H, MK0L, MK0H, MK1L, MK1H, PR0L, PR0H, PR1L, and
PR1H registers.
2. Instruction M: Instruction other than interrupt request hold instruction
3. The
IF
However, the software interrupt activated by executing the BRK instruction causes the IE flag
to be cleared. Therefore, even if a maskable interrupt request is generated during execution of
the BRK instruction, the interrupt request is not acknowledged.
PR (priority level) values do not affect the operation of
Instruction N
Figure 19-11. Interrupt Request Hold
CHAPTER 19 INTERRUPT FUNCTIONS
Preliminary User’s Manual U19748EJ1V0UD
Instruction M
PSW and PC saved, jump
to interrupt servicing
IF (instruction request).
Interrupt servicing
program
These