mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 333

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
When DDRDx is a logic 1, reading address $0003 reads the PTDx data
latch. When DDRDx is a logic 0, reading address $0003 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
Table 18-7
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect the input.
DDRD
Bit
0
1
summarizes the operation of the port D pins.
PTD Bit
Input/Output (I/O) Ports
X
X
(1)
Table 18-7. Port D Pin Functions
Input, Hi-Z
I/O Pin
Output
Mode
(2)
Read/Write
DDRD[7:0]
DDRD[7:0]
Accesses
to DDRD
PTD[7:0]
Read
Accesses to PTD
Input/Output (I/O) Ports
Pin
PTD[7:0]
PTD[7:0]
Data Sheet
Write
Port D
(3)
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