upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 430
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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16.1 Functions of Power-on-Clear Circuit
430
The power-on-clear circuit (POC) has the following functions.
• Generates internal reset signal at power on.
• Compares supply voltage (V
Note For the
In the 2.7 V/1.59 V POC mode (option byte: POCMODE = 1)
voltage (V
Caution If an internal reset signal is generated in the POC circuit, the reset control flag register (RESF)
Remark This product incorporates multiple hardware functions that generate an internal reset signal. A flag
when V
DD
DD
< V
is cleared to 00H.
that indicates the reset source is located in the reset control flag register (RESF) for when an internal
reset signal is generated by the watchdog timer (WDT) or low-voltage-detector (LVI). RESF is not
cleared to 00H and the flag is set to 1 when an internal reset signal is generated by WDT or LVI.
For details of RESF, see CHAPTER 15 RESET FUNCTION.
µ
) exceeds 2.7 V ±0.2 V.
PD78F0730, be sure to set the 2.7 V/1.59 V POC mode by using the option byte (POCMODE = 1).
POC
, and releases reset when V
CHAPTER 16 POWER-ON-CLEAR CIRCUIT
DD
) and detection voltage (V
Preliminary User’s Manual U19014EJ1V0UD
DD
≥ V
DDPOC
.
POC
= 1.59 V ±0.15 V), generates internal reset signal
Note
, the reset signal is released when the supply
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