Datasheet

General Description
MC68HC908QY/QT Family Data Sheet, Rev. 6
22 Freescale Semiconductor
1.5 Pin Functions
Table 1-2 provides a description of the pin functions.
Table 1-2. Pin Functions
Pin
Name
Description Input/Output
V
DD
Power supply Power
V
SS
Power supply ground Power
PTA0
PTA0 — General purpose I/O port Input/Output
AD0 — A/D channel 0 input Input
TCH0 — Timer Channel 0 I/O Input/Output
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 — Timer clock input Input
PTA3
PTA3 — General purpose I/O port Input/Output
RST — Reset input, active low with internal pullup and Schmitt trigger 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
PTB[0:7]
(1)
1. The PTB pins are not available on the 8-pin packages (see note in 12.1 Introduction).
8 general-purpose I/O ports Input/Output