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參數(shù)資料
型號: MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁數(shù): 58/130頁
文件大小: 1200K
代理商: MC68HC05P18A
L
G
R
Input/Output (I/O) Ports
Technical Data
MC68HC05P18A
58
Input/Output (I/O) Ports
MOTOROLA
7.5 Port C
Port C is an 8-bit bidirectional port that can share pins PC3–PC7 with the
analog-to-digital (A/D) converter subsystem. The port C data register is
located at address $0002 and its data direction register (DDR) is located
ataddress$0006.Resetdoesnotaffectthedataregisters,butclearsthe
DDRs, thereby setting all of the port pins to input mode. Writing a 1 to a
DDR bit sets the corresponding port pin to output mode (see
Figure 7-3
). Two port C pins, PC0 and PC1, can source and sink a
higher current than a typical I/O pin. See
Section 13. Electrical
Specifications
regarding current specifications.
Port C may be used for general I/O applications when the A/D
subsystem is disabled. The ADON bit in the A/D status and control
register (ADSC) is used to enable/disable the A/D subsystem.
CAUTION:
Care must be exercised when using pins PC0–PC2 while the A/D
subsystem is enabled. Accidental changes to bits that affect pins
PC3–PC7inthedataorDDRregisterswillproduceunpredictableresults
in the A/D subsystem.
See
Section 11. Analog-to-Digital (A/D) Converter
.
Figure 7-3. Port C I/O Circuitry
READ $0002
WRITE $0002
READ $0006
DATA
REGISTER BIT
I/O
PIN
OUTPUT
INTERNAL HC05
DATA BUS
RESET
(RST)
WRITE $0006
DATA DIRECTION
REGISTER BIT
HIGH CURRENT
CAPABILITY, PC0
AND PC1 ONLY
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相關代理商/技術參數(shù)
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