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參數(shù)資料
| 型號： | MC68HC05CJ4FB |
| 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, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 44/114頁 |
| 文件大?。?/td> | 4047K |
| 代理商： | MC68HC05CJ4FB |
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GENERAL RELEASE SPECIFICATION
INPUT/OUTPUT PORTS
Rev. 2.1
7-1
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SECTION 7
INPUT/OUTPUT PORTS
7.1 Introduction
In user mode there are 32 lines arranged as four 8-bit ports. Most of these port pins
are programmable as either inputs or outputs under software control of the data
direction registers, though some are input only.
NOTE
To avoid a glitch on the output pins, write data to the I/O port data
register before writing a one to the corresponding data direction
register.
7.2 Port A
Port A is an 8-bit bidirectional port which does not share any of its pins with other
subsystems. The port A data register is at $0000 and the data direction register
(DDR) is at $0004. Reset does not affect the data registers, but clears the data
direction registers, thereby returning the ports to inputs. Writing a one to a DDR bit
sets the corresponding port bit to output mode.
7.3 Port B
Port B is an 8-bit bidirectional port. The port B data register is at $0001 and the data
direction register (DDR) is at $0005. Reset does not affect the data registers, but
clears the data direction registers, thereby returning the ports to inputs. Writing a
one to a DDR bit sets the corresponding port pin to output mode.
7.4 Port C
Port C is an 8-bit bidirectional port. The port C data register is at $0002 and the
data direction register (DDR) is at $0006. Reset does not affect the data registers,
but clears the data direction registers, thereby returning the ports to inputs. Writing
a one to a DDR bit sets the corresponding port bit to output mode. PC7 has a high
current sink and source capability.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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