MC68HC908AP16CFA MOTOROLA [Motorola, Inc], MC68HC908AP16CFA Datasheet - Page 368

• Manufacturer Part Number: MC68HC908AP16CFA
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Input/Output (I/O) Ports
Data Sheet
368
Figure 18-4
When DDRAx is a logic 1, reading address $0000 reads the PTAx data
latch. When DDRAx is a logic 0, reading address $0000 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
Table 18-2
Notes:
DDRA
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
Freescale Semiconductor, Inc.
Bit
0
1
For More Information On This Product,
READ DDRA ($0004)
WRITE DDRA ($0004)
WRITE PTA ($0000)
READ PTA ($0000)
PTA
X
Bit
summarizes the operation of the port A pins.
X
(1)
Go to: www.freescale.com
shows the port A I/O logic.
I/O Pin Mode
Table 18-2. Port A Pin Functions
Input, Hi-Z
Figure 18-4. Port A I/O Circuit
RESET
Output
(2)
Accesses to DDRA
DDRAx
PTAx
Read/Write
DDRA[7:0]
DDRA[7:0]
MC68HC908AP Family — Rev. 2.5
PTA[7:0]
Read
Accesses to PTA
Pin
MOTOROLA
PTA[7:0]
PTA[7:0]
Write
PTAx
(3)