UPD78F1502AGK-GAK-AX Datasheet, PDF (796/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 21 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 acknowledgment is
enabled, vectored interrupt servicing is carried out. If interrupt acknowledgment is disabled, the next address
instruction is executed.
Figure 21-3. HALT Mode Release by Interrupt Request Generation
Standby
release signal
HALT
instruction
Interrupt
request
Operating mode
Status of CPU
High-speed system clock,
internal high-speed oscillation clock,
20 MHz internal high-speed oscillation clock,
or subsystem clock
HALT mode
Wait^Note
Oscillation
Operating mode
Note The wait time is as follows:
• When vectored interrupt servicing is carried out
When main system clock is used: 10 to 12 clocks
When subsystem clock is used: 8 to 10 clocks
• When vectored interrupt servicing is not carried out
When main system clock is used: 5 or 6 clocks
When subsystem clock is used: 3 or 4 clocks
Remark The broken lines indicate the case when the interrupt request which has released the standby mode is
acknowledged.
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011