mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 268

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
Technical Data
268
When bit DDRAx is a logic 1, reading address $0000 reads the PTAx
data latch. When bit 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.
the operation of the port A pins.
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
DDRA
Bit
0
1
PTA Bit
Input/Output (I/O) Ports
X
X
(1)
Table 14-2. Port A Pin Functions
I/O Pin Mode
Input, Hi-Z
Output
(2)
Read/Write
DDRA[7:0]
DDRA[7:0]
Accesses
to DDRA
Table 14-2
MC68HC908JB16
PTA[7:0]
Freescale Semiconductor
Read
Accesses to PTA
Pin
summarizes
PTA[7:0]
PTA[7:0]
—
Write
Rev. 1.1
(3)