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參數(shù)資料
型號： MC68HC05C8A
廠商： Motorola, Inc.
英文描述： Microcontrollers
中文描述： 微控制器
文件頁數(shù)： 56/158頁
文件大小： 773K
代理商： MC68HC05C8A
Input/Output (I/O) Ports
Technical Data
MC68HC05C8A
MC68HCL05C8A
MC68HSC05C8A
—
Rev. 5.0
56
Input/Output (I/O) Ports
MOTOROLA
7.3 Port A
Port A is an 8-bit bidirectional port which does not share any of its pins
with other subsystems. The port A data register is at $0000 and the data
direction register (DDR) is at $0004. 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.
7.4 Port B
Port B is an 8-bit bidirectional port. The port B data register is at $0001
and the data direction register (DDR) is at $0005. 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 pin to output mode. Each of the port B pins has a
mask programmable interrupt capability. This interrupt option also
enables a pullup device when the pin is configured as an input (see
Figure 7-1
). The edge or edge and level sensitivity of the IRQ pin also
will pertain to the enabled port B pins via mask options. Be careful when
using port B pins that have the pullup enabled. Before switching from an
output to an input, the data should be preconditioned to a 1 to prevent
an interrupt from occurring.
Figure 7-1. Port B Pullup Option
PB0
V
DD
V
DD
DDR BIT
NORMAL PORT CIRCUITRY
AS SHOWN IN
FIGURE 7-2
FROM ALL OTHER PORT B PINS
IRQ
SCHMITT
TRIGGER
TO INTERRUPT
LOGIC
MASK OPTION
相關(guān)PDF資料
PDF描述
MC68HC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HCL05C9A 8-Bit Microcontroller(8位微控制器)
MC68HSC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HC05F2 8-Bit Microcontroller Units (MCU).(8位微控制器)
MC68HC05F6 8-Bit Microcontroller Units (MCU).(8位微控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC05C8ACFN 制造商:Motorola Inc 功能描述:MicroController, 8-Bit, 44 Pin, Plastic, PLCC
MC68HC05C9 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:TECHNICAL DATA
MC68HC05C9A 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AFB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
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