Reset; Reset Circuit; Fig. 2.7.1 Power-On Reset Circuit Example; Fig. 2.7.2 Oscillation Stabilizing Time After System Is Released From Reset - Renesas 4513 User Manual

APPLICATION

2.7 Reset

2.7 Reset
System reset is performed by applying "L" level to
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
of the internal oscillation stabilizing time (f(X
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 V
distance.
V
D D
RESET pin
(Note)
Note:
This symbol represents a parasitic diode.
Applied potential to RESET pin must be V

Fig. 2.7.1 Power-on reset circuit example

1 machine cycle or more
0.85V
DD
RESET
0.3V
DD
(Note)

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

2-56
pin, the software starts from address 0 in page 0 after elapsing
RESET
IN
Internal reset signal
Voltage drop detection circuit
WEF
Reset input
f(X
IN
16895 times.
Note: Keep the value of supply voltage to the minimum value
or more of the recommended operating conditions.
4513/4514 Group User's Manual
pin for 1 machine cycle or more when the
the RESET
) is counted for 16892 to 16895 machine cycles). Figure 2.7.2
Watchdog timer output
Power-on
or less.
DD
is counted 16892 to
)
SS
V
DD
RESET pin voltage
Reset state
Internal reset signal
Reset released
Software starts
(address 0 in page 0)
at the shortest