UPD784020 Datasheet, PDF (9/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCOMPUTER

mPD784020, 784021
P00-P07
: Port 0
P10-P17
: Port 1
P20-P27
: Port 2
P30-P37
: Port 3
P60-P63, P66, P67 : Port 6
P70-P77
: Port 7
TO0-TO3
: Timer output
CI
: Clock input
RxD, RxD2
: Receive data
TxD, TxD2
: Transmit data
SCK0-SCK2
: Serial clock
ASCK, ASCK2 : Asynchronous serial clock
SI0-SI2
: Serial input
SO0-SO2
: Serial output
SB0
: Serial bus
PWM0, PWM1 : Pulse width modulation output
NMI
: Non-maskable interrupt
INTP0-INTP5
: Interrupt from peripherals
AD0-AD7
: Address/data bus
A8-A19
: Address bus
RD
: Read strobe
WR
: Write strobe
WAIT
: Wait
HLDRQ
: Hold request
HLDAK
: Hold acknowledge
ASTB
: Address strobe
REFRQ
: Refresh request
RESET
: Reset
X1, X2
: Crystal
ANI0-ANI7 : Analog input
ANO0, ANO1 : Analog output
AVREF1-AVREF3 : Reference voltage
AVDD
: Analog power supply
AVSS
: Analog ground
VDD
: Power supply
VSS
: Ground
TEST
: Test
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