参数资料
型号: MC68HC705C9ACFS
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER
文件页数: 147/177页
文件大小: 1941K
代理商: MC68HC705C9ACFS
Input/Output (I/O) Ports
Port C
MC68HC705C9A — Rev. 4.0
Advance Information
MOTOROLA
Input/Output (I/O) Ports
71
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. The contents of the
port C data register are indeterminate at initial powerup and must be
initialized by user software. 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. Figure 7-1 is also
applicable to port C.
7.6 Port D
When configured as a C9A, port D is a 7-bit bidirectional port; when
configured as a C12A, port D is a 7-bit fixed input port. Four of its pins
are shared with the SPI subsystem and two more are shared with the
SCI subsystem. The contents of the port D data register are
indeterminate at initial powerup and must be initialized by user software.
During reset all seven bits become valid input ports because the C9A
DDR bits are cleared and the special function output drivers associated
with the SCI and SPI subsystems are disabled, thereby returning the
ports to inputs. Writing a 1 to a DDR bit sets the corresponding port bit
to output mode only when configured as a C9A.
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