UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 756

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

754
• When AMPH = 1
(a) Release by unmasked interrupt request
Standby release signal
Standby release signal
(external clock input)
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.
Note
Remark The broken lines indicate the case when the interrupt request that has released the standby mode
(2) When high-speed system clock (external clock input) is used as CPU clock (1/2)
Status of CPU
(X1 oscillation)
system clock
Status of CPU
The wait time is as follows:
High-speed
system clock
High-speed
• When vectored interrupt servicing is carried out:
• When vectored interrupt servicing is not carried out:
is acknowledged.
(1) When high-speed system clock (X1 oscillation) is used as CPU clock
Figure 20-6. STOP Mode Release by Interrupt Request Generation (1/2)
Normal operation
Normal operation
system clock)
system clock)
(high-speed
Oscillates
(high-speed
Oscillates
instruction
CHAPTER 20 STANDBY FUNCTION
Preliminary User’s Manual U19748EJ1V0UD
STOP
instruction
STOP
Oscillation stopped
STOP mode
Oscillation stopped
STOP mode
Interrupt
request
Interrupt
request
Oscillation stabilization time (set by OSTS)
Oscillation stabilization wait
Supply of the CPU
(160 external
clock is stopped
(HALT mode status)
clocks)
(set by OSTS)
Oscillates
8 or 9 clocks
2 or 3 clocks
Wait
Wait
Oscillates
Note
Normal operation
Normal operation
system clock)
system clock)
(high-speed
(high-speed
After the oscillation