RL78/G1P
CHAPTER 16 STANDBY FUNCTION
R01UH0895EJ0100 Rev.1.00
598
Nov 29, 2019
(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 16-3. HALT Mode Release by Interrupt Request Generation
HALT
instruction
Operating mode
HALT mode
Operating mode
Oscillation
High-speed system clock or
High-speed on-chip oscillator clock
Status of CPU
Standby
release signal
Note 1
Interrupt
request
Wait
Note 2
Notes 1.
For details of the standby release signal, see
Figure 15-1
.
2.
Wait time for HALT mode release
When vectored interrupt servicing is carried out
Main system clock: 15 to 16 clock
When vectored interrupt servicing is not carried out
Main system clock: 9 to 10 clock
Remark
The broken lines indicate the case when the interrupt request which has released the standby mode is
acknowledged.