UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 248

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

15.1 Functions of Power-on-Clear Circuit
248
The power-on-clear circuit (POC) has the following functions.
• Generates internal reset signal at power on.
• Compares supply voltage (V
• Compares supply voltage (V
Cautions 1. If an internal reset signal is generated in the POC circuit, the reset control flag register
Remark This product incorporates multiple hardware functions that generate an internal reset signal. A flag that
when V
when V
DD
DD
indicates the reset cause 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-detection (LVI) circuit. 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 14 RESET FUNCTION.
2. Use these products in the following voltage range because the detection voltage (V
< V
≥ V
(RESF) is cleared to 00H.
POC circuit is the supply voltage range.
Standard product, (A) grade product: 2.2 to 5.5 V, (A2) grade product: 2.26 to 5.5 V
POC
POC
.
.
CHAPTER 15 POWER-ON-CLEAR CIRCUIT
DD
DD
) and detection voltage (V
) and detection voltage (V
User’s Manual U16898EJ5V0UD
POC
POC
= 2.1 V (TYP.)), and generates internal reset signal
= 2.1 V (TYP.)), and releases internal reset signal
POC
) of the