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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
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