UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 670

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

(2) STOP mode release by INTP4 or INTP5 input
(3) STOP mode release by RESET input
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When masking of interrupts by INTP4 and INTP5 input is released and macro service is disabled, the oscillator resumes
oscillation when the valid edge specified by external interrupt mode register 1 (INTM1) is input to the INTP4 or INTP5
input. Following this, 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 an interrupt can be acknowledged when the interrupt enable
flag (IE) is set (1), a branch is made to the interrupt service program. If the interrupt cannot be acknowledged and
if the IE flag is cleared (0), execution is resumed from the instruction following the instruction that set the STOP mode.
See 20.7 MASKABLE INTERRUPT ACKNOWLEDGMENT OPERATION for details of interrupt acknowledgment.
When RESET input falls from high to low and the reset state is established, the oscillator resumes oscillation. The
oscillation stabilization time should be secured while RESET is active. Thereafter, normal operation is started when
RESET rises.
Unlike an ordinary reset operation, data memory retains its contents prior to STOP mode setting.
INTP4, INTP5 Input
Rising Edge
STP F/F1
STP F/F2
Oscillator
Specified
fxx/2
Figure 22-8 STOP Mode Release by INTP4/INTP5 Input
CHAPTER 22 STANDBY FUNCTION
STOP
Oscillation Stopped
Oscillation Stabilization
Count Time