General Description
MC68HC908QL4 MC68HC908QL3 MC68HC908QL2 Data Sheet, Rev. 4
22
Freescale Semiconductor
Table 1-2. Pin Functions
Pin
Name
Description
Input/Output
V
DD
V
SS
Power supply
Power
Power supply ground
Power
PTA0
PTA0 — General purpose I/O port
Input/Output
AD0 — A/D channel 0 input
Input
KBI0 — Keyboard interrupt input 0
Input
PTA1
PTA1 — General purpose I/O port
Input/Output
AD1 — A/D channel 1 input
Input
TCH1 — Timer Channel 1 I/O
Input/Output
KBI1— Keyboard interrupt input 1
Input
PTA2
PTA2 — General purpose input-only port
Input
IRQ — External interrupt with programmable pullup and Schmitt trigger input
Input
KBI2 — Keyboard interrupt input 2
Input
TCLK — External clock source input for the TIM module
Input
PTA3
PTA3 — General purpose I/O port
Input/Output
RST — Reset input, active low with internal pullup and Schmitt trigger input
Input
KBI3 — Keyboard interrupt input 3
Input
PTA4
PTA4 — General purpose I/O port
Input/Output
OSC2 — XTAL oscillator output (XTAL option only)
RC or internal oscillator output (OSC2EN = 1 in PTAPUE register)
Output
Output
AD2 — A/D channel 2 input
Input
KBI4 — Keyboard interrupt input 4
Input
PTA5
PTA5 — General purpose I/O port
Input/Output
OSC1 — XTAL, RC, or external oscillator input
Input
AD3 — A/D channel 3 input
Input
KBI5 — Keyboard interrupt input 5
Input
PTB0
PTB0 — General purpose I/O port
Input/Output
TCH0 — Timer Channel 0 I/O
Input/Output
PTB1
PTB1 — General purpose I/O port
Input/Output
PTB2
PTB2 — General purpose I/O port
Input/Output
AD4 — A/D channel 4 input
Input
PTB3
PTB3 — General purpose I/O port
Input/Output
AD5 — A/D channel 5 input
Input
PTB4
PTB4 — General purpose I/O port
Input/Output
SLCRx — SLC receive input
Input
PTB5
PTB5 — General purpose I/O port
Input/Output
SLCTx — SLC transmit output
Output
PTB6, PTB7
General-purpose I/O port
Input/Output