UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 277

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

14.4.3 Software interrupt request acknowledgement operation
be disabled.
word (PSW) and the program counter (PC), in that order, the IE flag is reset to 0, the contents of the vector table
(003EH and 003FH) are loaded to the PC, and execution branches.
CPU processing
CPU processing
The software interrupt request can be acknowledged when the BRK instruction is executed. This interrupt cannot
When the software interrupt request is acknowledged, the contents are saved to the stack, the program status
To return from the software interrupt servicing, use the RETB instruction.
Caution Do not use the RETI instruction to return from the software interrupt.
(
(
(
(
PR = 1)
PR = 0)
PR = 1)
PR = 0)
IF
IF
IF
IF
Figure 14-13. Interrupt Request Acknowledgement Timing (Maximum Time)
Figure 14-12. Interrupt Request Acknowledgement Timing (Minimum Time)
Remark 1 clock:
Remark 1 clock:
Instruction
Instruction
CHAPTER 14 INTERRUPT FUNCTIONS
f
f
CPU
CPU
1
User’s Manual U13029EJ7V1UD
1
(f
(f
CPU
CPU
: CPU clock)
: CPU clock)
Division instruction
Instruction
25 clocks
33 clocks
32 clocks
8 clocks
Saving PSW and PC, jumping
Saving PSW and PC, jumping
to interrupt servicing
to interrupt servicing
7 clocks
6 clocks
6 clocks
servicing
Interrupt
program
servicing
Interrupt
program
275