参数资料
型号: MC68HC705J2CP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP20
封装: PLASTIC, DIP-20
文件页数: 13/82页
文件大小: 2545K
代理商: MC68HC705J2CP
PARALLEL I/O
3-2
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
DDR Bit
I/O Pin Function
0
The I/O pin is an input. Data is written into the output data latch.
0
1
Data is written into the output data latch, which drives the I/O pin.
1
0
The state of the I/O pin is read.
1
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).
CONNECTIONS
T
O
INTERNAL
D
ATA
B
U
S
F
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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