NEC 78K0 User Manual page 50

(2) Non-port pins (2/2)
Pin Name I/O
PCL Output
BUZ Output
AD0 to AD7 I/O
A8 to A15 Output
RD Output
WR Output
WAIT Input
ASTB Output
ANI0 to ANI7 Input
AV Input
REF
−
AV
SS
KR0 to KR7 Input
−
REGC
RESET Input
X1 Input
−
X2
XT1 Input
−
XT2
−
V
DD
−
EV
DD
−
V
SS
−
EV
SS
−
IC
−
V
PP
50
CHAPTER 2 PIN FUNCTIONS
Function
Clock output (for trimming of X1 input clock, subsystem clock)
Buzzer output
Lower address/data bus for external memory expansion
Higher address bus for external memory expansion
Strobe signal output for external memory read operation
Strobe signal output for external memory write operation
Wait insertion on external memory access
Strobe output that externally latches address information output
to ports 4 and 5 for access to external memory
A/D converter analog input
A/D converter reference voltage input and positive power supply
for port 2
A/D converter ground potential. Make the same potential as
EV or V .
SS SS
Key interrupt input
Connecting regulator output stabilization capacitor. When using
the regulator, connect to V via a capacitor (1
SS
recommended). When the regulator is not used, connect
directly to V .
DD
System reset input
Connecting resonator for X1 input clock oscillation
Connecting resonator for subsystem clock oscillation
Positive power supply (except for ports)
Positive power supply for ports
Ground potential (except for ports)
Ground potential for ports
Internally connected. Connect directly to EV
Flash memory programming mode setting. High-voltage
application for program write/verify. Connect to EV
normal operation mode.
User's Manual U15947EJ2V0UD
After Reset
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
µ
F:
*
or V .
SS SS
or V in
SS SS
Alternate Function
P140/INTP6
P141/INTP7/BUSY0
P40 to P47
P50 to P57
P64
P65
P66
P67
P20 to P27
− −
− −
P70 to P77
− −
− −
− −
− −
− −
− −
− −
− −
− −
− −
− −
− −