UPD78F9500MA-CAC-A Datasheet, PDF (192/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 11 STANDBY FUNCTION
(2) HALT mode release
The HALT mode can be released by the following two sources.
(a) Release by unmasked interrupt request
When an unmasked interrupt request is generated, the HALT mode is released. If interrupt
acknowledgement is enabled, vectored interrupt servicing is carried out. If interrupt acknowledgement is
disabled, the next address instruction is executed.
Figure 11-2. HALT Mode Release by Interrupt Request Generation
Standby
release signal
HALT
instruction
Interrupt
request
Wait
Operating mode
Status of CPU
System clock
oscillation
HALT mode
Wait
Oscillation
Operating mode
Remarks 1. The broken lines indicate the case when the interrupt request which has released the
standby mode is acknowledged.
2. The wait time is as follows:
• When vectored interrupt servicing is carried out: 11 to 13 clocks
• When vectored interrupt servicing is not carried out: 3 to 5 clocks
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User’s Manual U18172EJ3V0UD