UPD78F0138 NEC, UPD78F0138 Datasheet - Page 391

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

(a) Release by unmasked interrupt request
Standby release signal
Standby release signal
When an unmasked interrupt request is generated, the STOP mode is released.
stabilization time has elapsed, if interrupt acknowledgment is enabled, vectored interrupt servicing is carried
out. If interrupt acknowledgment is disabled, the next address instruction is executed.
Remarks 1. The broken lines indicate the case when the interrupt request that has released the standby
Ring-OSC clock
Status of CPU
X1 input clock
Status of CPU
2. f
mode is acknowledged.
R
Figure 19-6. STOP Mode Release by Interrupt Request Generation
: Ring-OSC clock oscillation frequency
Operating mode
(X1 input clock)
(Ring-OSC clock)
Operating mode
Oscillates
(2) When Ring-OSC clock is used as CPU clock
(1) When X1 input clock is used as CPU clock
instruction
STOP
instruction
CHAPTER 19 STANDBY FUNCTION
STOP
User’s Manual U16228EJ2V0UD
Oscillation stopped
STOP mode
STOP mode
Oscillation stabilization time (set by OSTS)
Oscillates
Operation
Oscillation stabilization wait
stopped
(17/f
(HALT mode status)
R
)
(set by OSTS)
Oscillates
Wait
(Ring-OSC clock)
Operating mode
After the oscillation
Operating mode
(X1 input clock)
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