upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 302

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(2) HALT mode release
302
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.
Remarks 1. The broken lines indicate the case when the interrupt request which has released the standby
X1 input clock or
Ring-OSC clock
Status of CPU
release signal
Standby
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
Figure 15-3. HALT Mode Release by Interrupt Request Generation
Operating mode
instruction
HALT
CHAPTER 15 STANDBY FUNCTION
User’s Manual U15836EJ5V0UD
HALT mode
Interrupt
request
Oscillation
Wait
Wait
8 or 9 clocks
Operating mode