UPD784224 Datasheet, PDF (15/92 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLERS

µPD784224, 784225, 784224Y, 784225Y
5.2 Pins Other Than Port Pins (2/2)
Pin Name
RD
WR
WAIT
ASTB
I/O
Output
Input
Output
Alternate Function
P64
P65
P66
P67
EXA
RESET
X1
X2
XT1
XT2
ANI0 to ANI7
ANO0, ANO1
AVREF1
AVDD
AVSS
VDD0
VSS0
VDD1
VSS1
TEST
Output
Input
Input
−
Input
−
Input
Output
−
P37
−
−
−
P10 to P17
P130, P131
−
Function
Strobe signal output for read operation of external memory
Strobe signal output for write operation of external memory
To insert wait state(s) when external memory is accessed
Strobe output to externally latch address information output to ports
4 to 6 to access external memory
External access status output
System reset input
To connect main system clock oscillation crystal
To connect subsystem clock oscillation crystal
Analog voltage input for A/D converter
Analog voltage output for D/A converter
To apply reference voltage for D/A converter
Positive power supply for A/D converter. Connected to VDD0.
GND for A/D converter and D/A converter. Connected to VSS0.
Positive power supply for port block
GND potential for port block
Positive power supply (except port block)
GND potential (except port block)
Connect this pin to VSS0 directly or via pull-down resistor. For the
pull-down connection, use of a resistor with a resistance ranging
from 470 Ω to 10 kΩ is recommended.
Data Sheet U12376EJ1V0DS00
15