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CHAPTER 15 STANDBY FUNCTION
User’s Manual U15104EJ2V0UD
(2) HALT mode release
The HALT mode can be released by the following three types of sources.
(a) Release upon 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 disabled, the next address instruction is executed.
Figure 15-2. HALT Mode Release upon Interrupt Generation
Remarks 1. The broken lines indicate the case when the interrupt request that released the standby
status is acknowledged.
2. Wait time will be as follows:
• When vectored interrupt servicing is carried out:
8 to 9 clocks
• When vectored interrupt servicing is not carried out: 2 to 3 clocks
(b) Release upon non-maskable interrupt request
When a non-maskable interrupt is generated, the HALT mode is released and vectored interrupt servicing
is carried out whether interrupt acknowledgement is enabled or disabled.
HALT
instruction
Wait
Standby
release signal
Operation
mode
Clock
HALT mode
Wait
Oscillation
Operation mode
Interrupt
request