參數資料
型號: MC68HC05X4CDWR2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數: 129/168頁
文件大?。?/td> 656K
代理商: MC68HC05X4CDWR2
MC68HC05X4 Rev 1.0
MOTOROLA
Parallel input/output ports
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
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