參數(shù)資料
型號(hào): MC68HC705X4CDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Microcontroller Unit
中文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數(shù): 63/156頁
文件大小: 926K
代理商: MC68HC705X4CDW
MC68HC05X4 Rev 1.0
MOTOROLA
Parallel input/output ports
For More Information On This Product,
Go to: www.freescale.com
63
Parallel input/output ports
General Description
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Input/output programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Port registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Port A data register (PADR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Port B data register (PBDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Port configuration register (PCR) . . . . . . . . . . . . . . . . . . . . . . . . . .66
Port A data direction register (PADDR) . . . . . . . . . . . . . . . . . . . . .67
Port B data direction register (PBDDR) . . . . . . . . . . . . . . . . . . . . .67
Introduction
In single chip mode there are 16 lines arranged as two 8-bit I/O ports.
The I/O ports are programmable as either inputs or outputs under
software control of the data direction registers. Wired-OR Interrupt
capability (refer to
Resets
) and/or a pull-down device can be activated
under software control on each I/O pin.
To avoid glitches on the output pins data should be written to the I/O port
data register before setting the pin to output mode, by writing a ‘1’ to the
corresponding data direction register.
1-ports
F
Freescale Semiconductor, Inc.
n
.
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