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參數(shù)資料
| 型號： | MC68HC05J3CDW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | PLASTIC, SOIC-20 |
| 文件頁數(shù)： | 24/92頁 |
| 文件大?。?/td> | 912K |
| 代理商： | MC68HC05J3CDW |
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MOTOROLA
4-2
MC68HC05J3
INPUT/OUTPUT PORTS
4
4.2
Port A
This port is a standard M68HC05 bidirectional I/O port, comprising a data register and a data
direction register.
Reset does not affect the state of the data register, but clears the data direction register, thereby
returning all port pins to input mode. Writing a ‘1’ to any DDR bit sets the corresponding port pin
to output mode.
4.3
Port B
In addition to the standard port functions, this 6-bit port has a programmable keyboard interrupt
feature on pins PB0–PB3 and shares two pins (PB4 and PB5) with the timer subsystem. On reset,
this port is congured as a standard I/O port, comprising a data register and a data direction
register.
Figure 4-1 Standard I/O port structure
Table 4-1 I/O pin states
R/W
DDRn
Action of MCU write to/read of data bit
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 to the I/O pin.
1
0
The state of the I/O pin is read.
1
The I/O pin is in output mode. The output data latch is read.
Latched data
register bit
DDRn
DATA
Input
buffer
Output
buffer
O/P
data
buffer
M68HC05
inter
nal
connections
DDRn
DATA
I/O Pin
1
0
1
0
tristate
0
1
tristate
I/O
pin
Input
Data direction
register bit
Output
TPG
27
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC05J3CP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit |
| MC68HC05J3DW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit |
| MC68HC05J3P | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit |
| MC68HC05J5A | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-bit microcontroller units |
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