參數(shù)資料
型號: MC68HC05P9ACDW
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, PDSO28
封裝: SOIC-28
文件頁數(shù): 122/158頁
文件大?。?/td> 3885K
代理商: MC68HC05P9ACDW
Parallel I/O Ports
66
Parallel I/O Ports
Introduction
Twenty bidirectional pins and one input-only pin form four parallel
input/output (I/O) ports. All the bidirectional port pins are programmable
as inputs or outputs.
NOTE:
Connect any unused I/O pins to an appropriate logic level, either V
DD or
V
SS. Although the I/O ports do not require termination for proper
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
Addr.
Name:
R/W
Bit 7
654321
Bit 0
$0000
Port A Data Register (PORTA)
Read:
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Write:
Reset:
Unaffected by reset
$0001
Port B Data Register (PORTB)
Read:
PB7
PB6
PB5
00000
Write:
Reset:
Unaffected by reset
$0002
Port C Data Register (PORTC)
Read:
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
Write:
Reset:
Unaffected by reset
$0003
Port D Data Register (PORTD)
Read:
PD7
0
PD5
10000
Write:
$0004
Data Direction Register A (DDRA)
Read:
DDRA7 DDRA6 DDRA5 DDRA4 DDRA3 DDRA2 DDRA1 DDRA0
Write:
Reset:
00000000
$0005
Data Direction Register B (DDRB)
Read:
DDRB7 DDRB6 DDRB5
00000
Write:
Reset:
00000000
= Unimplemented
Figure 28. Parallel I/O Port Register Summary
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For More Information On This Product,
Go to: www.freescale.com
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