參數(shù)資料
型號(hào)： MC68HC05J3CDW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝： PLASTIC, SOIC-20
文件頁(yè)數(shù)： 22/92頁(yè)
文件大?。?/td> 912K
代理商： MC68HC05J3CDW
MC68HC05J3
MOTOROLA
4-1
INPUT/OUTPUT PORTS
4
INPUT/OUTPUT PORTS
In single chip mode, the MC68HC05J3 has a total of 14 I/O lines, arranged as one 8-bit port (A)
and one 6-bit port (B). Each I/O line is individually programmable as either input or output, under
the software control of the data direction registers. Four of the port B pins can be congured to
respond to keyboard interrupts, while the other two are shared with the timer subsystem. The port
B conguration register provides the control for all pins of port B.
To avoid glitches on the output pins, data should be written to the I/O port data register before
writing ones to the corresponding data direction register bits to set the pins to output mode.
4.1
Input/output programming
The bidirectional port lines may be programmed as inputs or outputs under software control. The
direction of each pin is determined by the state of the corresponding bit in the port data direction
register (DDR). Each port has an associated DDR. Any I/O port pin is congured as an output if
its corresponding DDR bit is set. A pin is congured as an input if its corresponding DDR bit is
cleared.
At power-on or reset, all DDRs are cleared, thus conguring all port pins as inputs. The data
direction registers can be written to or read by the MCU. During the programmed output state, a
read of the data register actually reads the value of the output data buffer and not the I/O pin. The
operation of the standard port hardware is shown schematically in Figure 4-1.
This is further summarized in Table 4-1, which shows the effect of reading from, or writing to an
I/O pin in various circumstances. Note that the read/write signal shown is internal and not available
to the user.
TPG
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)PDF資料
PDF描述
MC68HC05JB3DW 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28
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MC68HC05JB3JP 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP20
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC05J3CP 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit
MC68HC05J3DW 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit
MC68HC05J3P 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit
MC68HC05J5A 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-bit microcontroller units
MC68HC05J5ADW 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-bit microcontroller units
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