upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 355

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

Watchdog timer
Port pin (P130)
Port pin (P130)
Note Set P130 to high-level output by software.
Remark When reset is effected, P130 outputs a low level. If P130 is set to output a high level before reset is
Note Set P130 to high-level output by software.
Caution A watchdog timer internal reset resets the watchdog timer.
Remark When reset is effected, P130 outputs a low level. If P130 is set to output a high level before reset is
(except P130)
(except P130)
system clock
system clock
High-speed
reset signal
High-speed
reset signal
CPU clock
CPU clock
oscillation
oscillation
overflow
Internal
Internal
Port pin
Port pin
Internal
RESET
Internal
clock
clock
effected, the output signal of P130 can be dummy-output as the CPU reset signal.
effected, the output signal of P130 can be dummy-output as the CPU reset signal.
Normal operation
Normal operation
Figure 19-3. Timing of Reset Due to Watchdog Timer Overflow
Figure 19-2. Timing of Reset by RESET Input
Delay
CHAPTER 19 RESET FUNCTION
User’s Manual U16962EJ3V0UD
(Oscillation stop)
(Oscillation stop)
Reset period
Reset period
Delay
Operation stop
Operation stop
(17/f
(17/f
R
R
)
)
Hi-Z
Hi-Z
Normal operation
(Reset processing, internal oscillation clock)
Normal operation
(Reset processing, internal oscillation clock)
Note
Note
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