NEC mPD789101 User Manual page 222

(2) Releasing HALT mode
The HALT mode can be released by the following three types of sources:
(a) Releasing by unmasked interrupt request
The HALT mode is released by an unmasked interrupt request. In this case, if the interrupt request is
able to be acknowledged, vectored interrupt processing is performed. If the interrupt is disabled, the
instruction at the next address is executed.
Standby
release signal
Operating
mode
Clock
Remarks 1. The broken lines indicate the case where the interrupt request that has released the
standby mode is acknowledged.
2. The wait time is as follows:
• When vectored interrupt processing is performed:
• When vectored interrupt processing is not performed: 1 to 2 clocks
(b) Releasing by non-maskable interrupt request
The HALT mode is released regardless of whether the interrupt is enabled or disabled, and vectored
interrupt processing is performed.
222
CHAPTER 16 STANDBY FUNCTION
Figure 16-2. Releasing HALT Mode by Interrupt
HALT
instruction
HALT mode
Oscillation
User's Manual U13045EJ2V0UM00
Wait
Wait Operating mode
9 to 10 clocks