MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 336
MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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Input/Output (I/O) Ports
Technical Data
336
NOTE:
Address:
DDRH[1:0] — Data Direction Register H Bits
Avoid glitches on port H pins by writing to the port H data register before
changing data direction register H bits from 0 to 1.
the port H I/O logic.
When DDRHx is a logic 1, reading address $000B reads the PTHx data
latch. When DDRHx is a logic 0, reading address $000B reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
Table 17-6
Reset:
Read:
Write:
These read/write bits control port H data direction. Reset clears
DDRH[1:0], configuring all port H pins as inputs.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Corresponding port H pin configured as output
0 = Corresponding port H pin configured as input
READ DDRH ($000F)
WRITE DDRH ($000F)
WRITE PTH ($000B)
READ PTH ($000B)
$000F
Bit 7
Figure 17-26. Data Direction Register H (DDRH)
0
0
summarizes the operation of the port H pins.
Go to: www.freescale.com
Input/Output (I/O) Ports
6
0
0
Figure 17-27. Port H I/O Circuit
RESET
5
0
0
DDRHx
PTHx
4
0
0
3
0
0
MC68HC908AB32
Figure 17-27
2
0
0
DDRH1
1
0
MOTOROLA
—
KBI
shows
DDRH0
Rev. 1.0
Bit 0
0
PTHx
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