mc68hc705j2 Freescale Semiconductor, Inc, mc68hc705j2 Datasheet - Page 17

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mc68hc705j2

Manufacturer Part Number
mc68hc705j2
Description
8-bit Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
MOTOROLA
3-2
NOTE: R/W is an internal MCU signal.
R / W
0
0
1
1
[1] Output buffer enables latched output to drive I/O pin when DDR bit is 1 (output mode).
[2] Input buffer enabled when DDR bit is 0 (input mode).
[3] Input buffer enabled when DDR bit is 1 (output mode).
DDR Bit
Figure 3-1. Parallel I/O Port Circuit
0
1
0
1
DATA DIRECTIO
The I/O pin is an input. Data is written into the output data latch.
Data is written into the output data latch, which drives the I/O pin.
The state of the I/O pin is read.
The I/O pin is an output. The output data latch is read.
Table 3-1. I/O Pin Functions
OUTPUT DATA
REGISTER
LATCHED
BIT
BIT
PARALLEL I/O
I/O Pin Function
[3]
[2]
[1]
PIN
I/O
MC68HC705J2

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