参数资料
型号: MC68HC705P6ADW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 81/130页
文件大小: 1541K
代理商: MC68HC705P6ADW
Input/Output Ports
Advance Information
MC68HC705P6A — Rev. 2.0
54
Input/Output Ports
MOTOROLA
6.5 Port C
Port C is an 8-bit bidirectional port which can share pins PC3–PC7 with
the A/D subsystem. The port C data register is located at address $0002
and its data direction register (DDR) is located at address $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 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 6-3).
Port C may be used for general I/O applications when the A/D
subsystem is disabled. The ADON bit in register ADSC is used to
enable/disable the A/D subsystem. Care must be exercised when using
pins PC0–PC2 while the A/D subsystem is enabled. Accidental changes
to bits that affect pins PC3–PC7 in the data or DDR registers will produce
unpredictable results in the A/D subsystem. See Section 9. Analog
Subsystem.
Figure 6-3. 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
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相关代理商/技术参数
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