Filter
Top Products
79
CHAPTER 4 PIN FUNCTION (
µ
PD78054Y Subseries)
(2) Pins other than port pins (2/2)
Pin Name
Input/Output
Function After Reset
Alternate Function
AD0 to AD7
Input/Output
Low-order address/data bus when expanding external memory Input P40 to P47
A8 to A15 Output High-order address bus when expanding external memory Input P50 to P57
RD Strobe signal output for read operation from external memory P64
WR Strobe signal output for write operation to external memory P65
WAIT Input Wait insertion when accessing external memory Input P66
Strobe output externally latching address information output to ports 4,
5 to access external memory
ANI0 to ANI7
Input A/D converter analog input Input P10 to P17
ANO0, ANO1
Output D/A converter analog output Input P130, P131
AVREF0 Input A/D converter reference voltage input — —
AVREF1 Input D/A converter reference voltage input — —
AVDD — A/D converter analog power supply. Connect to VDD.——
AVSS — A/D and D/A converter ground potential. Connect to VSS.——
RESET Input System reset input — —
X1 Input ——
X2 — ——
XT1 Input Input P07
XT2 — ——
VDD — Positive power supply — —
High-voltage application for program write/verify. Directly connect to
VSS in normal operating mode.
VSS — Ground potential — —
IC — Internally connected. Connect directly to VSS.——
4.1.2 PROM programming mode pins (PROM versions only)
Pin Name
Input/Output
Function
PROM programming mode setting.
RESET Input When +5 V or +12.5 V is applied to the VPP pin or a low level voltage is applied to the RESET pin,
the PROM programming mode is set.
VPP Input High-voltage application for PROM programming mode setting and program write/verify.
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
VDD — Positive power supply
VSS — Ground potential
ASTB Output Input P67
VPP — ——
Output Input
Crystal connection for main system clock oscillation
Crystal connection for subsystem clock oscillation