mc68hc11f1cpu3 Freescale Semiconductor, Inc, mc68hc11f1cpu3 Datasheet - Page 81

• Manufacturer Part Number: mc68hc11f1cpu3
• Description: Mc68hc11f1 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

6.1 Port A
PORTA — Port A Data
TECHNICAL DATA
RESET:
Alt. Pin
And/or:
Func.:
The MC68HC11F1 MCU has up to 54 input/output lines, depending on the operating
mode. The data bus of this microcontroller is nonmultiplexed. I/O lines are organized
into seven parallel ports. Ports with bidirectional pins have an associated data direc-
tion control register. This register (DDRx) contains a data direction control bit for each
bidirectional port line. The following table is a summary of the configuration and fea-
tures of each port.
Port pin function is mode dependent. Do not confuse pin function with the electrical
state of the pin at reset. Port pins are either driven to a specified logic level or are con-
figured as high impedance inputs. I/O pins configured as high-impedance inputs have
port data that is indeterminate. The contents of the corresponding latches are depen-
dent upon the electrical state of the pins during reset. In port descriptions, an “I” indi-
cates this condition. Port pins that are driven to a known logic level during reset are
shown with a value of either one or zero. Some control bits are unaffected by reset.
Reset states for these bits are indicated with a “U”.
Port A has eight bidirectional I/O pins and shares functions with the timer system.
Port C
Port D
Port G
Port A
Port B
Port E
Port F
Port
Bit 7
OC1
PA7
PAI
I
SECTION 6 PARALLEL INPUT/OUTPUT
Input Pins
OC2
OC1
PA6
6
I
Freescale Semiconductor, Inc.
—
—
—
—
—
—
8
For More Information On This Product,
Table 6-1 I/O Port Configuration
OC3
OC1
PA5
5
Output Pins
I
PARALLEL INPUT/OUTPUT
Go to: www.freescale.com
—
—
—
—
—
8
8
OC4
OC1
PA4
4
I
Bidirectional Pins
IC4/OC5
OC1
PA3
3
I
—
—
—
8
8
6
8
PA2
IC1
—
2
I
PA1
IC2
—
High-Order Address
Chip Select Outputs
Low-Order Address
1
Shared Functions
I
A/D Converter
SCI and SPI
Data Bus
Timer
Bit 0
PA0
IC3
—
I
$1000
6-1