参数资料
型号: MC68HC05E1MP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 44/86页
文件大小: 709K
代理商: MC68HC05E1MP
MC68HC05E1 — Revision 2.0
General Release Specication
MOTOROLA
Input/Output Ports
49
General Release Specification — MC68HC05E1
Section 4. Input/Output Ports
4.1 Contents
4.2 Introduction
In single-chip mode there will be 20 lines arranged as two 8-bit I/O port
and one 4-bit I/O port. These ports are programmable as either inputs or
outputs under software control of the data direction registers.
To avoid a glitch on the output pins, write data to the I/O Port Data
Register before writing a one to the corresponding Data Direction
Register.
4.3 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 one to a DDR bit sets the corresponding port
bit to output mode.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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