Freescale Semiconductor, Inc.
2.10 Port Signals
In the 44-pin PLCC package, 32 input/output lines are arranged into four 8-bit ports:
A, B, C, and D. The lines of ports B, C, and D are fully bidirectional. Each of these four
ports serves a purpose other than I/O, depending on the operating mode or peripheral
functions selected. Note that ports B, C, and two bits of port D are available for I/O
functions only in single-chip and bootstrap modes. Refer to Table 2-1 for details about
the 32 port signals' functions within different operating modes.
Table 2-1 Port Signal Functions
Port/Bit
Single-Chip and
Bootstrap Mode
Expanded Multiplexed and
Special Test Mode
PA0
PA1
PA2
PA3
PA4*
PA5
PA6*
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PA0/IC3
PA1/IC2
PA2/IC1
PA3/OC5/IC4/OC1
PA4/OC4/OC1
PA5/OC3/OC1
PA6/OC2/OC1
PA7/PAI/OC1
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
ADDR8
ADDR9
ADDR10
ADDR11
ADDR12
ADDR13
ADDR14
ADDR15
ADDR0/DATA0
ADDR1/DATA1
ADDR2/DATA2
ADDR3/DATA3
ADDR4/DATA4
ADDR5/DATA5
ADDR6/DATA6
ADDR7/DATA7
PD0/RxD
PD1/TxD
PD2/MISO
PD3/MOSI
PD4/SCK
PD5/SS
PD6
PD7
AS
R/W
*In the 40-pin package, pins PA4 and PA6 are not bonded. Their associated I/O and output compare functions are
not available externally. They can still be used as internal software timers, however.
PIN DESCRIPTIONS
2-6
TECHNICAL DATA
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