參數(shù)資料
型號: MC68HC05E5P
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, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 85/140頁
文件大小: 847K
代理商: MC68HC05E5P
MC68HC05E5 Rev. 1.0
General Release Specification
MOTOROLA
Input/Output (I/O) Ports
49
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Release Specification — MC68HC05E5
Section 7. Input/Output (I/O) Ports
7.1 Contents
7.2 Introduction
In single-chip mode, 20 lines are arranged as two 8-bit input/output (I/O)
ports 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
(DDR).
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 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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