mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 274

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

Input/Output (I/O) Ports
Technical Data
274
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.
the operation of the port D pins.
Notes:
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 ($0007)
WRITE DDRD ($0007)
WRITE PTD ($0003)
READ PTD ($0003)
PTD Bit
Input/Output (I/O) Ports
X
X
(1)
Table 14-4. Port D Pin Functions
Figure 14-10. Port D I/O Circuit
RESET
I/O Pin Mode
Input, Hi-Z
Output
(2)
DDRDx
PTDx
Read/Write
DDRD[5:0]
DDRD[5:0]
Accesses
to DDRD
Table 14-4
MC68HC908JB16
PTD[5:0]
Freescale Semiconductor
Read
Accesses to PTD
Pin
summarizes
PTD[5:0]
PTD[5:0]
—
Write
Rev. 1.1
PTDx
(3)