Prom Programming Mode Pins ( Pd78P078 Only) - NEC PD78076 User Manual

(2) Non-port pins (2/2)
Pin Name
Input/Output
AD0 to AD7 Low-order address/data bus when expanding external memory
Input/Output
A0 to A7 Output Low-order address bus when expanding external memory
A8 to A15 Output High-order address bus when expanding external memory
RD Strobe signal output for read operation from external memory
Output
WR Strobe signal output for write operation to external memory
WAIT Input Wait insertion when accessing external memory
Strobe output externally latching address information output to ports 4,
ASTB Output
5 to access external memory
ANI0 to ANI7 Input A/D converter analog input
ANO0, ANO1 Output D/A converter analog output
AV Input A/D converter reference voltage input
REF0
AV Input D/A converter reference voltage input
REF1
AV — A/D converter analog power supply. Connect to V
DD
AV — A/D converter, D/A converter ground potential. Connect to V
SS
RESET Input System reset input
X1 Input Crystal connection for main system clock oscillation
X2 —
Crystal connection for subsystem clock oscillation
XT1 Input
XT2 —
V — Positive power supply
DD
High-voltage application for program write/verify. Connect directly to
V —
PP
V in normal operating mode.
SS
V — Ground potential
SS
IC — Internally connected. Connect directly to V

3.1.2 PROM programming mode pins ( PD78P078 only)

Pin Name
Input/Output
PROM programming mode setting.
RESET Input When +5 V or +12.5 V is applied to the V
the PROM programming mode is set.
V Input High-voltage application for PROM programming mode setting and program write/verify.
PP
A0 to A16 Input Address bus
D0 to D7 Input/output Data bus
CE Input PROM enable input/program pulse input
OE Input Read strobe input to PROM
PGM Input Program/program inhibit input in PROM programming mode
V — Positive power supply
DD
V — Ground potential
SS
CHAPTER 3 PIN FUNCTION ( PD78078 SUBSERIES)
Function
Function
.
DD
.
SS
SS.
pin or a low level voltage is applied to the RESET pin,
PP
After Reset Alternate Function
Input P40 to P47
Input P80 to P87
Input P50 to P57
P64
Input
P65
Input P66
Input P67
Input P10 to P17
Input P130, P131
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Input P07
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