MITSUBISHI MICROCOMPUTERS
4280 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
RESET FUNCTION
In order to make the built-in power-on reset circuit operate
efficiently, set the voltage rising time until VDD= 0 to 2.2 V is
obtained at power-on 1ms or less.
The 4280 Group has the power-on reset circuit, though it does
not have RESET pin. System reset is performed automatically
at power-on, and software starts program from address 0 in page
0.
f(XIN)
“H”
Internal reset signal
“L”
Software starts
(address 0 in page 0)
f(XIN) 16384 pulses
Fig. 17 Reset release timing
VDD
Power-on reset circuit
output voltage
Internal reset signal
Power-on reset circuit
Reset state
Voltage drop detection circuit
Watchdog timer output
Internal reset signal
Reset released
Power-on
Fig. 18 Power-on reset circuit example
MITSUBISHI
ELECTRIC
16
MITSUBISHI [ Mitsubishi Group ]
