Stop Mode - NEC 78K0 Series User Manual

Table 21-2. Operation in Response to Interrupt Request in HALT Mode
Release Source
Maskable interrupt
request
Reset
×: don't care

21.2.2 STOP mode

(1) STOP mode setting and operating statuses
The STOP mode is set by executing the STOP instruction, and it can be set only when the CPU clock before the
setting was the main system clock.
Caution Because the interrupt request signal is used to clear the standby mode, if there is an interrupt
source with the interrupt request flag set and the interrupt mask flag reset, the standby mode is
immediately cleared if set. Thus, the STOP mode is reset to the HALT mode immediately after
execution of the STOP instruction and the system returns to the operating mode as soon as the
wait time set using the oscillation stabilization time select register (OSTS) has elapsed.
The operating statuses in the STOP mode are shown below.
516
CHAPTER 21 STANDBY FUNCTION
MK×× PR×× IE
0 0 0
0 0 1
0 1 0
×
0 1
0 1 1
× ×
1
− − ×
Preliminary User's Manual U17260EJ3V1UD
ISP Operation
×
Next address
instruction execution
×
Interrupt servicing
execution
1 Next address
instruction execution
0
1 Interrupt servicing
execution
×
HALT mode held
×
Reset processing