CHAPTER 2 PIN FUNCTIONS
37
User’s Manual U11302EJ4V0UM
(2) Non-port pins (2/2)
Pin Name
I/O
Function
After
Alternate
Reset
Function
X1
Input
Crystal resonator connection for main system clock oscillation
—
—
X2
—
—
—
XT1
Input
Crystal resonator connection for subsystem clock oscillation
Input
P04
XT2
—
—
—
V
DD
—
Positive power supply
—
—
V
PP
—
High-voltage application for program write/verify. Connect
—
—
directly to V
SS
in normal operation mode.
V
SS
—
Ground potential
—
—
IC
—
Internally connected. Connect directly to V
SS
.
—
—
2.1.2 PROM programming mode pins (
µ
PD78P0208 only)
Pin Name
I/O
Function
RESET
Input
PROM programming mode setting.
When +5 V or +12.5 V is applied to the V
PP
pin or a low-level voltage is applied to the RESET
pin, the PROM programming mode is set.
V
PP
Input
High-voltage application for PROM programming mode setting and program write/verify
A0 to A16
Input
Address bus
D0 to D7
I/O
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
DD
—
Positive power supply
V
SS
—
Ground potential
Содержание mPD780208 Subseries
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