Renesas RL78/G15

RL78/G15 CHAPTER 15 STANDBY FUNCTION
R01UH0959EJ0110 Rev.1.10 Page 627 of 765
Mar 7, 2023
(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 15-1. HALT Mode Release by Interrupt Request Generation
HALT instruction
Wait
Note
2
Operating modeHALT mode
Operating mode
Oscillation
Status of CPU
Standby release
signal
Note
1
Interrupt request
High
-speed system clock
Note 3
or High-
speed on-chip
oscillator clock
Note 1. For details of the standby release signal, see Figure 14-1 Basic Configuration of Interrupt Function.
Note 2. Wait time for HALT mode release:
 When vectored interrupt servicing is carried out: 24 or 25 clocks
 When vectored interrupt servicing is not carried out: 18 or 19 clocks
Note 3. 16-pin and 20-pin products only.
Remark The broken lines indicate the case when the interrupt request which has released the standby mode is
acknowledged.