mc68hc11f1cpu3 Freescale Semiconductor, Inc, mc68hc11f1cpu3 Datasheet - Page 21

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

2.11.1 Port A
TECHNICAL DATA
Port A is an 8-bit general-purpose I/O port with a data register (PORTA) and a data
direction register (DDRA). Port A pins share functions with the 16-bit timer system.
PORTA can be read at any time. Inputs return the pin level; outputs return the pin driv-
er input level. If written, PORTA stores the data in internal latches. It drives the pins
only if they are configured as outputs. Writes to PORTA do not change the pin state
when the pins are configured for timer output compares.
Out of reset, port A pins [7:0] are general-purpose high-impedance inputs. When the
timer functions associated with these pins are disabled, the bits in DDRA govern the
I/O state of the associated pin. For further information, refer to SECTION 6 PARAL-
LEL INPUT/OUTPUT.
When using the information about port functions, do not confuse pin
function with the electrical state of the pin at reset. All general-pur-
pose I/O pins configured as inputs at reset are in a high-impedance
state. Port data registers reflect the logic state of the port at reset.
The pin function is mode dependent.
Port/Bit
PB[7:0]
PC[7:0]
PE[7:0]
PF[7:0]
PG0
PG1
PG2
PG3
PG4
PG5
PG6
PG7
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PD0
PD1
PD2
PD3
PD4
PD5
Freescale Semiconductor, Inc.
For More Information On This Product,
Table 2-1 Port Signal Functions
Go to: www.freescale.com
PIN DESCRIPTIONS
Single-Chip and
Bootstrap Mode
PB[7:0]
PC[7:0]
PF[7:0]
PG4
PG5
PG6
PG7
PA3/OC5/IC4/OC1
NOTE
PE[7:0]/AN[7:0]
PA4/OC4/OC1
PA5/OC3/OC1
PA6/OC2/OC1
PA7/PAI/OC1
PD2/MISO
PD3/MOSI
PD4/SCK
PD0/RxD
PD1/TxD
PA0/IC3
PA1/IC2
PA2/IC1
PD5/SS
PG0
PG1
PG2
PG3
Special Test Mode
Expanded and
PG7/CSPROG
PG6/CSGEN
ADDR[15:8]
PG4/CSIO2
PG5/CSIO1
ADDR[7:0]
DATA[7:0]
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