參數(shù)資料
型號: MC68HC05C9ECP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 96/144頁
文件大?。?/td> 1628K
代理商: MC68HC05C9ECP
MC68HC05C9E
Advance Information
MOTOROLA
Input/Output Ports
55
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Advance Information — MC68HC05C9E
Section 7. Input/Output Ports
7.1 Contents
7.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.3
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.4
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.5
Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.6
Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.2 Introduction
This section briefly describes the 31 input/output (I/O) lines arranged as
one 7-bit and three 8-bit ports. All of these port pins 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 1 to the corresponding data direction register.
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 data
direction register (DDR) is at $0004. The contents of the port A data
register are indeterminate at initial power-up and must be initialized by
user software. Reset does not affect the data registers, but clears the
data direction registers, thereby returning the ports to inputs. Writing a 1
to a DDR bit sets the corresponding port bit to output mode. A block
diagram of the port logic is shown in Figure 7-1.
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