參數(shù)資料
型號: MC68HC05T7B
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, PDIP56
封裝: SDIP-56
文件頁數(shù): 95/109頁
文件大?。?/td> 9008K
代理商: MC68HC05T7B
Parallel I/O Ports
Port A
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 3.0
Technical Data
MOTOROLA
Parallel I/O Ports
85
7.3 Port A
Port A is an 8-bit bidirectional port.
7.3.1 Port A Data Register
The port A data register contains a latch for each port A pin.
PA[7:0] — Port A Data Bits
These read/write bits are software programmable. Data direction of
each port A pin is under the control of the corresponding bit in data
direction register A. Reset has no effect on port A data.
7.3.2 Data Direction Register A
Data direction register A determines whether each port A pin is an input
or an output.
Address:
$0000
Bit 7
6
54321
Bit 0
Read:
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Write:
Reset:
Unaffected by reset
Figure 7-2. Port A Data Register (PORTA)
Address:
$0004
Bit 7
6
54321
Bit 0
Read:
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
Write:
Reset:
00
000000
Figure 7-3. Data Direction Register A (DDRA)
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