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| 型號(hào)： | MC68HC05C9AMB |
| 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, PDIP42 |
| 封裝： | SHRINK, PLASTIC, DIP-42 |
| 文件頁(yè)數(shù)： | 61/124頁(yè) |
| 文件大?。?/td> | 774K |
| 代理商： | MC68HC05C9AMB |
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MC68HC05C9A Advance Information Data Sheet, Rev. 5.1
Freescale Semiconductor
41
Chapter 7
Input/Output Ports
7.1 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.
7.2 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.
Figure 7-1. Port A I/O Circuit
DATA DIRECTION
REGISTER BIT
LATCHED OUTPUT
DATA BIT
I/O
PIN
INPUT
REG.
BIT
INPUT
I/O
OUTPUT
INTERNAL
HC05
CONNECTIONS
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC05C9AMFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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| MC68HC05C9AP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC05C9CP | 制造商:Motorola Inc 功能描述:IC UP HCMOS 68HC05C9CP DIP40 0 |
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