UPD78361A Datasheet, PDF (50/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78361A, 78362A
6. RESET FUNCTION
When a low level is input to the RESET pin, the system is reset, and each hardware enters the initial status
(reset status). When the RESET pin goes high, the reset status is released, and program execution is started.
Initialize the contents of each register through program as necessary.
Especially, change the number of cycles of the programmable wait control register as necessary.
The RESET pin is equipped with a noise rejecter circuit of analog delay to prevent malfunctioning due to noise.
Caution While the RESET pin is active (low level), all the pins go into a high-impedance state (except
AVREF, AVDD, AVSS, VDD, VSS, X1, and X2 pins).
Figure 6-1. Accepting Reset Signal
RESET input
Analog
delay
Rejected
as noise
Analog
delay
Reset
accepted
Analog
delay
Reset
released
To effect reset on when power is applied, make sure that sufficient time elapses to stabilize the oscillation
after the power is applied until the reset signal is accepted, as shown in Figure 6-2.
Figure 6-2. Reset on Power Application
VDD
RESET
Oscillation
stabilization
time
Analog
delay
Reset
released
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