4513 datasheet(159/210 Pages) RENESAS

159 / 210 page

APPLICATION

2-56

4513/4514 Group User’s Manual

2.7 Reset

System reset is performed by applying “L” level to the RESET pin for 1 machine cycle or more when the

following conditions are satisfied:

the value of supply voltage is the minimum value or more of the recommended operating conditions

oscillation is stabilized.

Then when “H” level is applied to RESET pin, the software starts from address 0 in page 0 after elapsing

of the internal oscillation stabilizing time (f(XIN) is counted for 16892 to 16895 machine cycles). Figure 2.7.2

shows the oscillation stabilizing time.

2.7.1 Reset circuit

The 4513/4514 Group has the power-on reset circuit and voltage drop detection circuit.

(1)

Power-on reset

Reset can be performed automatically at power on (power-on reset) by connecting resistors, a diode,

and a capacitor to RESET pin. Connect a capacitor between the RESET pin and VSS at the shortest

distance.

Fig. 2.7.1 Power-on reset circuit example

Fig. 2.7.2 Oscillation stabilizing time after system is released from reset

RESET

0.3VDD

0.85VDD

Software starts

(address 0 in page 0)

f(XIN)

is counted 16892 to

16895 times.

(Note)

Note: Keep the value of supply voltage to the minimum value

or more of the recommended operating conditions.

Reset input

1 machine cycle or more

2.7 Reset

VDD

RESET pin

WEF

(Note)

Internal reset signal

Voltage drop detection circuit

Watchdog timer output

VDD

RESET pin voltage

Power-on

Reset released

Internal reset signal

Reset state

Note:

This symbol represents a parasitic diode.

Applied potential to RESET pin must be VDD or less.

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