參數(shù)資料
型號: MC68HC05CT4FN
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.048 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 94/142頁
文件大?。?/td> 624K
代理商: MC68HC05CT4FN
MC68HC05CT4 Rev. 2.0
General Release Specification
MOTOROLA
Parallel Input/Output (I/O)
55
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Release Specification — MC68HC05CT4
Section 7. Parallel Input/Output (I/O)
7.1 Contents
7.2 Introduction
In user mode 31 lines are arranged as one 7-bit and three 8-bit ports.
Most of these port pins are programmable as either inputs or outputs
under software control of the data direction registers, though some are
input only.
NOTE:
To avoid a glitch on the output pins, write data to the I/O port data
register before writing a logic 1 to the corresponding data direction
register.
7.3 Port A
Port A is an 8-bit bidirectional port that 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 logic 1 to a DDR bit sets the corresponding port
bit to output mode.
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