UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 669

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(1) STOP mode release by NMI input
The oscillator resumes oscillation when the valid edge specified by external interrupt mode register 0 (INTM0) is input
to the NMI input. STOP mode is released after the oscillation stabilization time specified by the oscillation stabilization
time specification register (OSTS) elapses.
When the PD784026 is released from STOP mode, if a non-maskable interrupt by NMI pin input can be acknowledged,
a branch is made to the NMI interrupt service program. If the interrupt cannot be acknowledged (if the STOP mode
is set in an NMI interrupt service program, etc.), execution is resumed from the instruction following the instruction that
set the STOP mode, and a branch is made to the NMI interrupt service program when acknowledgment becomes
possible (by execution of an RETI instruction, etc.).
See 20.6 NON-MASKABLE INTERRUPT ACKNOWLEDGMENT OPERATION for details of NMI interrupt acknowledgment.
Rising Edge
NMI Input
STP F/F1
STP F/F2
Oscillator
Specified
fxx/2
Figure 22-7 STOP Mode Release by NMI Input
STOP
CHAPTER 22 STANDBY FUNCTION
Oscillator Stopped
Oscillation Stabilization
Count Time
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