参数资料
型号: MC68HC05BS8FB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封装: PLASTIC, QFP-44
文件页数: 46/128页
文件大小: 9691K
代理商: MC68HC05BS8FB
3-2
MC68HC05BS8
INPUT/OUTPUT PORTS
3
3.2
Port A, B, and C
These are standard M68HC05 bidirectional I/O ports, each comprising a data register and a data
direction register. All three are 8-bit ports.
Reset does not affect the state of the data registers, but clears the data direction registers, thereby
returning all port pins to input mode. Writing a “1” to any DDR sets the corresponding port pin to
output mode.
3.3
PB7 - RSPWM Counter Reset
In addition to normal I/O function, PB7 can be software selectable to input a reset signal to the
Raster Positioning Pulse Width Modulator counter. The reset pulse requires an active high signal.
3.4
PC0:5 - Keyboard Interrupts
Six keyboard interrupt inputs are available on port pins PC0 to PC5. Each pin is enabled for
keyboard interrupt by setting the corresponding keyboard interrupt enable bit in the KBI register
(bits 0 to 5 of $001E). When the KBI bit is set, the corresponding port C pin will be congured as
an input pin, regardless of the DDRC setting, an internal pull-up resistor is connected to the pin.
Figure 3-1 Port I/O Circuitry
INPUT
REGISTER
BIT
INPUT I/O
OUTPUT
I/O PIN
DATA DIRECTION
REGISTER BIT
LATCHED OUTPUT
DATA BIT
INTERNAL
MC68HC05
CONNECTIONS
TPG
22
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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