參數(shù)資料
型號: MC68HLC705KJ1CDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 126/144頁
文件大?。?/td> 1377K
代理商: MC68HLC705KJ1CDWR2
Technical Data
MC68HC705KJ1 — Rev. 2.0
82
Parallel I/O Ports
MOTOROLA
Parallel I/O Ports
Addr.
Register Name:
Bit 7
6
5
4
3
2
1
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:
0
See Note
PB3
PB2
See Note
Write:
Reset:
Unaffected by reset
$0004
Data Direction Register A
(DDRA)
Read:
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
Write:
Reset:
0
$0005
Data Direction Register B
(DDRB)
Read:
0
See Note
DDRB3
DDRB2
See Note
Write:
Reset:
0
$0010
Port A Pulldown Register
(PDRA)
Read:
Write:
PDIA7
PDIA6
PDIA5
PDIA4
PDIA3
PDIA2
PDIA1
PDIA0
Reset:
0
$0011
Port B Pulldown Register
(PDRB)
Read:
Write:
See Note
PDIB3
PDIB2
See Note
Reset:
0
= Unimplemented
Note:
PB5, PB4, PB1, and PB0 should be configured as inputs at all times. These bits are available for read/write but are not available exter-
nally. Configuring them as inputs will ensure that the pulldown devices are enabled, thus properly terminating them.
Figure 7-1. Parallel I/O Port Register Summary
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