MC68HC05E5 Datasheet, PDF (51/140 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
Input/Output (I/O) Ports
Input/Output Programming
Table 7-1. I/O Pin Functions
R/W
DDR
I/O Pin Function
0
0
The I/O pin is in input mode. Data is written into the output
data latch.
0
1
Data is written into the output data latch and output of
the I/O pin.
1
0
The state of the I/O pin is read.
1
1
The I/O pin is in an output mode. The output data latch
is read.
DATA DIRECTION
REGISTER BIT
INTERNAL
HC05
CONNECTIONS
LATCHED OUTPUT
DATA BIT
INPUT
REGISTER
BIT
I/O
OUTPUT
PIN
INPUT
I/O
Figure 7-1. Port I/O Circuitry
MC68HC05E5 — Rev. 1.0
General Release Specification
Input/Output (I/O) Ports
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