mc68hc908jw32 Freescale Semiconductor, Inc, mc68hc908jw32 Datasheet - Page 175

• Manufacturer Part Number: mc68hc908jw32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Figure 13-13
When bit DDRDx is a logic 1, reading address $0003 reads the PTDx data latch. When bit 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.
Freescale Semiconductor
shows the port D I/O circuit logic.
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
DDRD
Bit
0
1
READ DDRD ($0008)
WRITE DDRD ($0008)
WRITE PTD ($0003)
READ PTD ($0003)
PTD Bit
X
X
(1)
Table 13-6. Port D Pin Functions
RESET
Figure 13-13. Port D I/O Circuit
MC68HC908JW32 Data Sheet, Rev. 5
I/O Pin Mode
Input, Hi-Z
Output
Table 13-6
(2)
DDRDx
PTDx
Read/Write
DDRD[7:0]
DDRD[7:0]
Accesses
to DDRD
summarizes the operation of the port D pins.
PTD[7:0]
Read
Pin
Accesses to PTD
PTD[7:0]
PTD[7:0]
Write
PTDx
(3)
Port D
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