mc68hc908gr8vp Freescale Semiconductor, Inc, mc68hc908gr8vp Datasheet - Page 154

• Manufacturer Part Number: mc68hc908gr8vp
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Input/Output Ports (I/O)
Figure 16-15
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.
154
PTDPUE Bit
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
4. I/O pin pulled up to V
X
1
0
shows the port D I/O logic.
DDRD Bit
0
0
1
READ DDRD ($0007)
WRITE DDRD ($0007)
WRITE PTD ($0003)
READ PTD ($0003)
DD
by internal pullup device.
PTD Bit
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
X
X
X
(1)
Table 16-5. Port D Pin Functions
RESET
Figure 16-15. Port D I/O Circuit
I/O Pin Mode
Input, Hi-Z
Input, V
Output
DD
Table 16-5
(4)
(2)
DDRDx
PTDx
Accesses to DDRD
DDRD6–DDRD0
DDRD6–DDRD0
DDRD6–DDRD0
Read/Write
summarizes the operation of the port D pins.
PTDPUEx
PTD6–PTD0
Read
Pin
Pin
V
Accesses to PTD
DD
Freescale Semiconductor
INTERNAL
PULLUP
DEVICE
PTDx
PTD6–PTD0
PTD6–PTD0
PTD6–PTD0
Write
(3)
(3)