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參數(shù)資料
型號: MC68HC05C8A
廠商: Motorola, Inc.
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 57/158頁
文件大小: 773K
代理商: MC68HC05C8A
Input/Output (I/O) Ports
Port C
MC68HC05C8A
MC68HCL05C8A
MC68HSC05C8A
Rev. 5.0
Technical Data
MOTOROLA
Input/Output (I/O) Ports
57
7.5 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 1 to a DDR bit sets the
corresponding port bit to output mode. PC7 has a high current sink and
source capability.
7.6 Port D
Port D is a 7-bit fixed input port. Four of its pins are shared with the SPI
subsystem, two more are shared with the SCI subsystem. Reset does
not affect the data registers. During reset, all seven bits become valid
input ports because all special function output drivers associated with
the SCI, timer, and SPI subsystems are disabled.
7.7 Input/Output Programming
I/O port pins may be programmed as inputs or outputs under software
control. The direction of the pins is determined by the state of the
corresponding bit in the port data direction register (DDR). Each I/O port
has an associated DDR. Any I/O port pin is configured as an output if its
corresponding DDR bit is set to a logic 1. A pin is configured as an input
if its corresponding DDR bit is cleared to a logic 0.
At power-on or reset, all DDRs are cleared, which configures all I/O pins
as inputs. The data direction registers are capable of being written to or
read by the processor. During the programmed output state, a read of
the data register actually reads the value of the output data latch and not
the I/O pin. For further information, refer to
Table 7-1
and
Figure 7-2
.
相關(guān)PDF資料
PDF描述
MC68HC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HCL05C9A 8-Bit Microcontroller(8位微控制器)
MC68HSC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HC05F2 8-Bit Microcontroller Units (MCU).(8位微控制器)
MC68HC05F6 8-Bit Microcontroller Units (MCU).(8位微控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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MC68HC05C9A 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
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