UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 540

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

23.1 Functions of Power-on-Clear Circuit
540
The power-on-clear circuit (POC) has the following functions.
• Generates internal reset signal at power on.
• Compares supply voltage (V
In the 1.59 V POC mode (option byte: POCMODE = 0), the reset signal is released when the supply voltage
(V
In the 2.7 V/1.59 V POC mode (option byte: POCMODE = 1), the reset signal is released when the supply
voltage (V
Caution If an internal reset signal is generated in the POC circuit, the reset control flag register (RESF)
Remark 78K0/KE2 incorporates multiple hardware functions that generate an internal reset signal. A flag that
when V
DD
) exceeds 1.59 V ±0.15 V.
DD
DD
< V
is cleared to 00H.
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 22 RESET FUNCTION.
) exceeds 2.7 V ±0.2 V.
POC
.
CHAPTER 23 POWER-ON-CLEAR CIRCUIT
DD
) and detection voltage (V
User’s Manual U17260EJ6V0UD
POC
= 1.59 V ±0.15 V), generates internal reset signal