參數(shù)資料
型號(hào): MC68HC05G3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 90/128頁
文件大?。?/td> 290K
代理商: MC68HC05G3
Page 54
MOTOROLA
Section 6: INPUT/OUTPUT PORTS
MC68HC05G3 (705G4) Specification Rev. 1.1
6.1.1
PORT A DATA REGISTER (PORTA)
READ:
anytime
(returns pin level if DDR set to input; returns output data latch if DDR set to
output)
WRITE:
anytime
(data stored in an internal latch; drives pin only if DDR set for output)
RESET:
becomes high impedance inputs
6.1.2
PORT A DATA DIRECTION REGISTER (DDRA)
READ:
anytime (when OPTM = 1)
WRITE:
anytime (when OPTM = 1)
RESET:
cleared to $00 (all general-purpose I/O configured for input)
DDRA
x
Port A Data Direction Register Bit
x
0 - configure I/O pin PA
x to input
1 - configure I/O pin PA
x to output
PA7
$0000
PA6
PA5
PA4
PA3
PA2
PA1
PA0
PORTA
B7
B6
B5
B4
B3
B2
B1
B0
UUUUUUUU
RESET:
DDRA7
option
map
$0000
DDRA6 DDRA5 DDRA4 DDRA3 DDRA2 DDRA1 DDRA0
DDRA
B7
B6
B5
B4
B3
B2
B1
B0
00000000
RESET:
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