
7534 Group
Rev.3.00 Oct 23, 2006 page 34 of 53
REJ03B0099-0300
Reset Circuit
The microcomputer is put into a reset status by holding the RESET
pin at the “L” level for 15 µs or more when the power source voltage
is 4.1 to 5.5 V and X
IN is in stable oscillation.
After that, this reset status is released by returning the RESET pin to
the “H” level. The program starts from the address having the con-
tents of address FFFD
16 as high-order address and the contents of
address FFFC16 as low-order address.
Note that the reset input voltage should be 0.82 V or less when the
power source voltage passes 4.1 V.
Fig. 40 Example of reset circuit
Fig. 41 Timing diagram at reset
(Note)
0.2 VCC
0 V
0 V
Poweron
VCCRESET
VCC
RESET
Power source
voltage
detection circuit
Power source
voltage
Reset input
voltage
Note : Reset release voltage Vcc = 4.1 V
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