NEC PD78058FY(A) - Manual (Page 81)

81
CHAPTER 4 PIN FUNCTION (
µ
PD78058FY SUBSERIES)
(2) Non-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 Output Strobe signal output for read operation from external memory Input P64
WR Strobe signal output for write operation to external memory P65
WAIT Input Wait insertion when accessing external memory Input P66
ASTB Output Strobe output externally latching address information output to ports 4, Input P67
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
AV
REF0
Input A/D converter reference voltage input — —
AV
REF1
Input D/A converter reference voltage input — —
AV
DD
— A/D converter analog power supply. (Common with the port power supply) — —
AV
SS
— Ground potential (common with the port’s ground potential) of the A/D — —
converter and D/A converter.
RESET Input System reset input — —
X1 Input Crystal connection for main system clock oscillation — —
X2 — — —
XT1 Input Crystal connection for subsystem clock oscillation Input P07
XT2 — — —
V DD — Positive power supply (Except the port) — —
V PP — High-voltage application for program write/verify. Connect directly to — —
V SS in the normal operating mode.
V
SS
— Ground potential (Except the port) — —
IC — Internally connected. Connect directly to V
SS
. — —
Cautions 1. The AV
DD
pin is used in common as the power supply for the A/D converter and port.
If this device is used in application fields where reduction of noise generated internally
in the microprocessor is required, please connect to a separate power supply with the
same electrical potential as V DD .
2. The AV SS pin is used as the ground potential for the A/D converter and
D/A convertor, and as the ground potential for the ports. If this device is used in
application fields where reduction of noise generated internally in the microprocessor
is required, please connect it to a ground line which is separate from V SS .