
MC68HC11P2
MOTOROLA
4-1
PARALLEL INPUT/OUTPUT
4
PARALLEL INPUT/OUTPUT
The MC68HC11P2 has up to 54 input/output lines and 8 input-only lines, depending on the
operating mode. To enhance the I/O functions, the data bus of this microcontroller is
nonmultiplexed. The following table is a summary of the conguration and features of each port.
Note:
Do not confuse pin function with the electrical state of that pin at reset. All
general-purpose I/O pins that are congured as inputs at reset are in a high-impedance
state and the contents of the port data registers are undened; in port descriptions, a
‘u’ indicates this condition. The pin function is mode dependent.
Table 4-1 Port conguration
Port
Input
pins
Output
pins
Bidirectional
pins
Alternate functions
A
8
Timer
B
8
High order address
C
8
Data bus
D
6
SPI and SCI1
E
8
A/D converter
F
8
Low order address
G
8
R/W on PG7
H
8
PWM and SCI2/3 (with MI BUS)