12
Pin
I/O
Assignment
Device
Remark
P85 I/O
JUMPER&E7
JUMPER&E7
MODE
SELECT
P86 I/O
E7 E7 MODE
SELECT
P87 I/O
E7 E7 MODE
SELECT
PB0/AN0 I
-
PB1/AN1 I
K1 Keyboard
Key
Return
Line
PB2/AN2 I
K2 Keyboard
Key
Return
Line
PB3/AN3 I
K3 Keyboard
Key
Return
Line
PB4/AN4 I
K4 Keyboard
Key
Return
Line
PB5/AN5 I
-
PB6/AN6
I
BTV
Battery
Detects Battery Voltage
PB7/AN7 I
-
NMI I
-
JUMPER
MODE
SELECT
OSC1
I
-
Oscillator
10 MHz Crystal
OSC2
O
-
Oscillator
10 MHz Crystal
X1 I
-
Oscillator
32.768
kHz
Crystal
X2 O
-
Oscillator
32.768
kHz
Crystal
AVCC -
-
- Analog
power
supply
VCL
-
-
-
Connected to VSS PIN
VCC -
- -
Power
supply
VSS -
- -
Ground
TEST
I
-
-
Connected to VSS PIN
RES
I
-
Reset device
System Reset