MC908QT4MPE datasheet(22/184 Pages) FREESCALE

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General Description

MC68HC908QY/QT Family Data Sheet, Rev. 5

Freescale Semiconductor

1.5 Pin Functions

Table 1-2 provides a description of the pin functions.

Table 1-2. Pin Functions

Name

Description

Input/Output

VDD

Power supply

Power

VSS

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

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

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