mc68hc908gr8a Freescale Semiconductor, Inc, mc68hc908gr8a Datasheet - Page 126
mc68hc908gr8a
Manufacturer Part Number
mc68hc908gr8a
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908GR8A.pdf
(260 pages)
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Input/Output (I/O) Ports
Figure 12-15
When bit DDRDx is a 1, reading address $0003 reads the PTDx data latch. When bit DDRDx is a 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.
126
1. X = Don’t care
2. I/O pin pulled up to V
3. Writing affects data register, but does not affect input.
4. Hi-Z = High impedance
PTDPUE
Bit
X
1
0
shows the port D I/O logic.
DDRD
Bit
0
0
1
DD
READ DDRD ($0007)
WRITE DDRD ($0007)
WRITE PTD ($0003)
READ PTD ($0003)
by internal pullup device.
PTD
X
Bit
X
X
(1)
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
Input, Hi-Z
Input, V
Table 12-5. Port D Pin Functions
RESET
Figure 12-15. Port D I/O Circuit
I/O Pin
Output
Mode
DD
(2)
(4)
Table 12-5
Accesses to DDRD
DDRDx
PTDx
DDRD6–DDRD0
DDRD6–DDRD0
DDRD6–DDRD0
Read/Write
summarizes the operation of the port D pins.
PTDPUEx
PTD6–PTD0
Read
Pin
Pin
Accesses to PTD
V
DD
Freescale Semiconductor
INTERNAL
PULLUP
DEVICE
PTDx
PTD6–PTD0
PTD6–PTD0
PTD6–PTD0
Write
(3)
(3)
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