参数资料
型号: MC68HC05RC18DW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 76/124页
文件大小: 457K
代理商: MC68HC05RC18DW
MC68HC05RC18 Rev. 2.0
General Release Specification
MOTOROLA
Parallel Input/Output (I/O)
55
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Release Specification — MC68HC05RC18
Section 6. Parallel Input/Output (I/O)
6.1 Contents
6.2 Introduction
In user mode, 24 lines (four of which are unavailable in the standard 28-
pin package) are arranged as three 8-bit I/O ports. These ports are
programmable as either inputs or outputs under software control of the
data direction registers.
NOTE:
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.
6.3 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
register, but clears the data direction register, 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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