NEC PD17062 Manuale Utente

µ

The reset function is used to initialize device operation.

Fig. 14-1 shows the configuration of the reset block.

Device reset is divided into reset by turning on V

DD

 (power-on reset or V

DD

 reset), and reset by CE pin (CE

reset).

The power-on reset block consists of a voltage detection circuit that detects the voltage applied to the V

DD

pin, a power failure detection circuit, and a reset control circuit.

The CE reset block consists of a circuit that detects the rising edge of the signal input to the CE pin, and

a reset control circuit.

X

OUT

X

IN

V

DD

CE

Power-on clear signal (POC)

Reset signal

IRES

RES

RESET

STOP instruction

R
S

Q

Selector

Timer carry FF

Timer FF block

Power failure detection block

Scaler

BTM0CY 
flag read

STOP
instruction

Voltage 
detection 
circuit

Control register
System register
Stack
Program counter

Forced halt by 
timer carry FF  

Rising edge
detection
circuit

Timer carry 
disable FF

Reset

control

circuit