MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 368
MC68HC908AZ32ACFU
Manufacturer Part Number
MC68HC908AZ32ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AZ32ACFU.pdf
(468 pages)
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I/O Ports
Advance Information
368
NOTE:
DDRA[7:0] — Data Direction Register A Bits
Avoid glitches on port A pins by writing to the port A data register before
changing data direction register A bits from 0 to 1.
Figure 23-4
When bit DDRAx is a logic 1, reading address $0000 reads the PTAx
data latch. When bit DDRAx is a logic 0, reading address $0000 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 A pins.
Freescale Semiconductor, Inc.
These read/write bits control port A data direction. Reset clears
DDRA[7:0], configuring all port A pins as inputs.
For More Information On This Product,
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
READ DDRA ($0004)
WRITE DDRA ($0004)
WRITE PTA ($0000)
READ PTA ($0000)
shows the port A I/O logic.
Go to: www.freescale.com
Figure 23-4. Port A I/O Circuit
I/O Ports
RESET
DDRAx
PTAx
Table 23-1
68HC908AZ32A — Rev 0.0
summarizes
MOTOROLA
PTAx
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