UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 752

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

20.2.2 STOP mode
(1) STOP mode setting and operating statuses
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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.
The operating statuses in the STOP mode are shown below.
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.
Maskable interrupt
request
Reset signal input
: don’t care
Table 20-2. Operation in Response to Interrupt Request in HALT Mode
Release Source
CHAPTER 20 STANDBY FUNCTION
Preliminary User’s Manual U19748EJ1V0UD
MK
0
0
0
0
0
1
PR
0
0
1
1
1
IE
0
1
0
1
ISP
1
0
1
Next address
instruction execution
Interrupt servicing
execution
Next address
instruction execution
Interrupt servicing
execution
HALT mode held
Reset processing
Operation