参数资料
型号: MC68HC05RC18FN
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, PQCC44
封装: PLASTIC, LCC-44
文件页数: 78/126页
文件大小: 1180K
代理商: MC68HC05RC18FN
MC68HC05RC18 Rev. 2.1
General Release Specification
Freescale Semiconductor
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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