Datasheet

General Description
MC68HC908QB8 Data Sheet, Rev. 3
22 Freescale Semiconductor
1.6 Pin Function Priority
Table 1-3 is meant to resolve the priority if multiple functions are enabled on a single pin.
NOTE
Upon reset all pins come up as input ports regardless of the priority table.
PTB4
PTB4 — General-purpose I/O port Input/Output
RxD — ESCI receive data I/O Input/Output
AD8 — A/D channel 8 input Input
PTB5
PTB5 — General-purpose I/O port Input/Output
TxD — ESCI transmit data I/O Output
AD9 — A/D channel 9 input Input
PTB6
PTB6 — General-purpose I/O port Input/Output
TCH2 — Timer channel 2 I/O Input/Output
PTB7
PTB7 — General-purpose I/O port Input/Output
TCH3 — Timer channel 3 I/O Input/Output
Table 1-3. Function Priority in Shared Pins
Pin Name Highest-to-Lowest Priority Sequence
PTA0
(1)
1. When a pin is to be used as an ADC pin, the I/O port function should be left as
an input and all other shared modules should be disabled. The ADC does not
override additional modules using the pin.
AD0 → TCH0 → KBI0 → PTA0
PTA1
(1)
AD1 → TCH1 → KBI1 → PTA1
PTA2 IRQ → TCLK → KBI2 → PTA2
PTA3 RST
→ KBI3 → PTA3
PTA4
(1)
OSC2 → AD2 → KBI4 → PTA4
PTA5
(1)
OSC1 → AD3 → KBI5 → PTA5
PTB0
(1)
AD4 → SPSCK → PTB0
PTB1
(1)
AD5 → MOSI → PTB1
PTB2
(1)
AD6 → MISO → PTB2
PTB3
(1)
AD7 → SS → PTB3
PTB4
(1)
AD8 → RxD → PTB4
PTB5
(1)
AD9 → TxD → PTB5
PTB6 TCH2 → PTB6
PTB7 TCH3 → PTB7
Table 1-2. Pin Functions (Continued)
Pin
Name
Description Input/Output