Freescale Semiconductor, Inc.
General Description
Pin Assignments
1.5.5 Port A Input/Output Pins (PTA7, PTA6/KBD6–PTA1/KBD1, and PTA0)
Port A is an 8-bit special function port that shares its pins with the
keyboard interrupt.
Six port A pins (PTA6–PTA1) can be programmed to serve as an
external interrupt. Once enabled, that pin will contain an internal pullup
resistor.
All port A pins are high-current sink pins.
1.5.6 Port B Input/Output Pins (PTB3/TCLK, PTB2/TCH0, PTB1, and PTB0/MCLK)
Port B is a 4-bit, general-purpose, bidirectional I/O port, with some of its
pins shared with the timer (TIM) module.
1.5.7 UHF Transmitter Pins
The MC68HC908RFRK2 uses dedicated pins for its UHF module. These
pins are described in Table 1-1.
Table 1-1. UHF Transmitter Pins
Pin Function
Description
1
2
UPCLK Clock output to the microcontroller
DATA
BS
Data input
3
Frequency band selection
GND
4
GND
XTAL1
XTAL0
REXT
PFD
5
Reference oscillator input
Reference oscillator output
6
7
Output amplifier current setting resistor
PLL loop filter
8
V
9
Supply voltage
CC
10
11
12
13
14
OP1
RF output
GND
RF GND
V
Supply voltage
CC
PLLEN PLL and UP clock enable
MODE UP clock enable; OOK/FSK; data clock for Manchester coding
MC68HC908RFRK2
MOTOROLA
AdvanceInformation
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General Description
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