upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 346

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(2) HALT mode release
346
The HALT mode can be released by the following two sources.
(a) Release by unmasked interrupt request
High-speed system clock,
internal oscillation clock,
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.
Remarks 1. The broken lines indicate the case when the interrupt request which has released the standby
or subsystem clock
Status of CPU
release signal
2. The wait time is as follows:
mode is acknowledged.
• When vectored interrupt servicing is carried out:
• When vectored interrupt servicing is not carried out: 2 or 3 clocks
Standby
Figure 18-3. HALT Mode Release by Interrupt Request Generation
Operating mode
CHAPTER 18 STANDBY FUNCTION
instruction
HALT
User’s Manual U16962EJ3V0UD
HALT mode
Interrupt
request
Oscillation
Wait
Wait
8 or 9 clocks
Operating mode