參數(shù)資料
型號: MC68HC05L25PB
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, PQFP52
封裝: TQFP-52
文件頁數(shù): 102/152頁
文件大?。?/td> 897K
代理商: MC68HC05L25PB
Port A
MC68HC05L25 Data Sheet, Rev. 3.1
Freescale Semiconductor
53
Figure 7-6. Port A7 I/O Circuitry
7.2.1 Port A Data Register
Each port A I/O pin has a corresponding bit in the port A data register. When a port A pin is programmed
as an output, the state of the corresponding data register bit determines the state of the output pin. When
a port A pin is programmed as an input, any read of the port A data register will return the logic state of
the corresponding I/O pin. The port A data register is unaffected by reset.
7.2.2 Port A Data Direction Register
Each port A I/O pin may be programmed as an input by clearing the corresponding bit in the DDRA or
may be programmed as an output by setting the corresponding bit in the DDRA. The DDRA can be
accessed at address $0000 of the option map. The DDRA is cleared by reset.
Address:
$0000
Bit 7
654321
Bit 0
Read:
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Write:
Reset:
Unaffected by Reset
Figure 7-7. Port A Data Register
Address:
$0000
Bit 7
654321
Bit 0
Read:
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
Write:
Reset:
00000000
Figure 7-8. Port A Data Direction Register
READ $0000
WRITE $0000
READ OPTN:$0000
DATA
REGISTER BIT
I/O
PIN
OUTPUT
INTERNAL HC05
DATA BUS
RESET
(RST)
WRITE OPTN:$0000
DATA DIRECTION
REGISTER BIT
R PULLUP
WRITE OPTN:$0008
PULLUP
REGISTER BIT
READ OPTN:$0008
PULLUP
LOGIC
WRITE OPTN:$000A
OPEN DRAIN
REGISTER BIT
READ OPTN:$000A
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