UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 750

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(2) HALT mode release
748
internal high-speed oscillation clock,
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.
Note The wait time is as follows:
Remark The broken lines indicate the case when the interrupt request which has released the standby
High-speed system clock,
or subsystem clock
• When vectored interrupt servicing is carried out:
• When vectored interrupt servicing is not carried out: 2 or 3 clocks
mode is acknowledged.
Status of CPU
release signal
Figure 20-3. HALT Mode Release by Interrupt Request Generation
Standby
Operating mode
CHAPTER 20 STANDBY FUNCTION
Preliminary User’s Manual U19748EJ1V0UD
instruction
HALT
HALT mode
Interrupt
request
Oscillation
8 or 9 clocks
Wait
Note
Operating mode