參數(shù)資料
型號: MC68HC05J1
廠商: Motorola, Inc.
英文描述: HCMOS MICROCONTROLLER UNIT
中文描述: HCMOS微控制器
文件頁數(shù): 20/82頁
文件大?。?/td> 327K
代理商: MC68HC05J1
MOTOROLA
3-2
PARALLEL I/O
MC68HC705J2
Rev. 2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Figure 3-1. Parallel I/O Port Circuit
NOTE: R/W is an internal MCU signal.
Table 3-1. I/O Pin Functions
R/W
0
0
1
1
DDR Bit
0
1
0
1
I/O Pin Function
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.
I/O
PIN
DATA DIRECTION
REGISTER
BIT
LATCHED
OUTPUT DATA
BIT
[1]
[2]
[3]
[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).
C
D
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