參數(shù)資料
型號: MC68HC05E6VFB
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, PQFP44
封裝: QFP-44
文件頁數(shù): 72/140頁
文件大小: 1141K
代理商: MC68HC05E6VFB
Input/Output Ports
Port A
MC68HC05E6 — Rev. 1.0
MOTOROLA
Input/Output Ports
37
Port A
This 8-bit port comprises a data register and a data direction register.
When the pins of port A are configured as inputs they have fixed pull-up
resistors connected to them.
The pull-ups and pull-downs associated with ports A, B and C are MOS
transistors which vary with the supply voltage and the loading on the
pins.
Reset does not affect the state of the data register, but clears the data
direction register, thereby returning all port pins to input mode with
pull-up resistors. Writing a ‘1’ to any DDR bit sets the corresponding port
pin to output mode.
Port B
This 8-bit port comprises a data register and a data direction register.
When the pins of port B are configured as inputs they have fixed
pull-down resistors connected to them.
Reset does not affect the state of the data register, but clears the data
direction register, thereby returning all port pins to input mode with
pull-down resistors. Writing a ‘1’ to any DDR bit sets the corresponding
port pin to output mode.
NOTE:
PB5–PB7 are not available in the 28-pin package.
Port C
This 8-bit bidirectional port shares two of its pins with the timer
subsystem and comprises a data register (PORTC), a data direction
register (DDRC) and a configuration register (CONFC). The behaviour
of the port C I/O pins is determined by the configuration of the DDRC and
the CONFC registers as shown in Table 5. During power-on or reset, all
3-ports
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