MC68HC908GR4 MOTOROLA [Motorola, Inc], MC68HC908GR4 Datasheet - Page 215
MC68HC908GR4
Manufacturer Part Number
MC68HC908GR4
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908GR4.pdf
(408 pages)
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MC68HC908GR8 — Rev 4.0
MOTOROLA
DDRB Bit
Notes:
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
0
1
PTB Bit
X
X
(1)
When bit DDRBx is a logic 1, reading address $0001 reads the PTBx
data latch. When bit DDRBx is a logic 0, reading address $0001 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 B pins.
Freescale Semiconductor, Inc.
I/O Pin Mode
Input, Hi-Z
For More Information On This Product,
Output
Table 16-3. Port B Pin Functions
READ DDRB ($0005)
WRITE DDRB ($0005)
WRITE PTB ($0001)
READ PTB ($0001)
Go to: www.freescale.com
(2)
Input/Output Ports (I/O)
Figure 16-8. Port B I/O Circuit
RESET
DDRB5–DDRB0
DDRB5–DDRB0
Read/Write
Accesses
to DDRB
DDRBx
PTBx
PTB5–PTB0
Read
Pin
Table 16-3
Accesses to PTB
Input/Output Ports (I/O)
PTB5–PTB0
PTB5–PTB0
summarizes
Technical Data
Write
Port B
(3)
PTBx
215
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