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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)： | 28/92頁 |
| 文件大?。?/td> | 912K |
| 代理商： | MC68HC05J3CDW |
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MOTOROLA
4-6
MC68HC05J3
INPUT/OUTPUT PORTS
4
4.5
Other port considerations
All output ports can emulate ‘open-drain’ outputs. This is achieved by writing a zero to the relevant
output port latch. By toggling the corresponding data direction bit, the port pin will either be an
output zero or tri-state (an input). This is shown diagrammatically in Figure 4-3.
When using a port pin as an ‘open-drain’ output, certain precautions must be taken in the user
software. If a read-modify-write instruction is used on a port where the ‘open-drain’ is assigned
and the pin at this time is programmed as an input, it will read it as a ‘one’. The read-modify-write
instruction will then write this ‘one’ into the output data latch on the next cycle. This would cause
the ‘open-drain’ pin not to output a ‘zero’ when desired.
Note:
‘Open-drain’ outputs should not be pulled above VDD.
Figure 4-3 Port logic levels
DDRn
A
Y
(b)
1
0
Normal operation – tri state
1
0
tri state
0
1
tri state
1
0
low
‘Open-drain’
1
—
0
high
0
1
high
Y
A
Read buffer output
Data direction register bit DDRn
Px0
VDD
VDD
DDRx, bit 0 = 0
Portx, bit 0 = 0
DDRx, bit 0 = 0
Portx, bit 0 = 0
(c)
(a)
‘Open-drain’ output
TPG
31
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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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 |
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| 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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