參數(shù)資料
型號(hào): MC68HC05C9AMB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
封裝: PLASTIC, SDIP-42
文件頁數(shù): 118/162頁
文件大小: 1093K
代理商: MC68HC05C9AMB
Input/Output Ports
Port C
MC68HC05C9A Rev. 5.0
Advance Information
MOTOROLA
Input/Output Ports
59
N
O
N-D
I
SC
L
O
SU
R
E
AG
R
EEMENT
R
E
Q
U
IR
ED
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
Port D is a 7-bit bidirectional port. Four of its pins are shared with the SPI
subsystem and two more are shared with the SCI subsystem. The port
D data register is at $0003 and the data direction register is at $0007.
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 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.
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