mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 407

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
17.3.3 Port C Data Direction Register (PCDDR)
The PCDDR determines the signal direction of each parallel port pin programmed as a
GPIO port in the PCCNT.
17.4 Port Data Registers
These 16-bit bidirectional registers are used to read or write the logic states of the GPIO
lines. This register has no effect on pins not configured for general-purpose I/O.
After a system reset, these register bits are all cleared. When any port lines are configured
as outputs, a logic zero appears on those pins, unless the data register is written with an
initial data value prior to setting the pin direction.
The reset values given in the following register diagrams are the port output values written
to the registers during reset, and do not reflect the value of a register read cycle. Register
reads always return the instantaneous value of the corresponding pins.
17.4.1 Port Data Register (PxDAT)
In the following description PxDAT refers to PADAT, PBDAT, or PCDAT.
The PxDAT value for inputs corresponds to the logic level at the pin; for outputs, the value
corresponds to the logic level driven onto the pin. Note that PxDAT has no effect on pins
which have not been configured for GPIO.
Reset
Reset
Field
Field
Addr
Addr
R/W
R/W
15
15
Figure 17-7. Port x Data Register (PADAT, PBDAT, and PCDAT)
Figure 17-6. Port C Data Direction Register (PCDDR)
MBAR + 0x0086 (PADAT); 0x008E (PBDAT); 0x0096 (PCDAT)
Chapter 17. General Purpose I/O Module
0000_0000_0000_0000
MBAR + 0x0094
Read/Write
Read/Write
Undefined
PCDDR
PxDAT
Port Data Registers
17-11
0
0