參數(shù)資料
型號: 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): 91/128頁
文件大?。?/td> 290K
代理商: MC68HC05G3
Page 55
Section 6: INPUT/OUTPUT PORTS
MOTOROLA
MC68HC05G3 (705G4) Specification Rev. 1.1
6.2
PORT B
Port B pins serve two basic functions: key wakeup interrupt (KWI) input pins and general-
purpose input pins.
Each KWI input is enabled or disabled by the corresponding KWIE
x bit in the KWIEN
register, and the usage of the KWI input does not affect the general-purpose input function.
Port B pin states may be read any time regardless of the configurations. Since port B has
no output drive logic associated with it, there is no DDRB register and the write to the
PORTB register has no meaning.
The pullup resistors are provided for both the upper and lower four bits of port B pins which
are controlled by the RBH and RBL bits in the RCR1 register. (The typical resistor values
are to be 50 K
@ 3 V.)
6.2.1
PORT B DATA REGISTER (PORTB)
READ:
anytime (returns pin level)
WRITE:
has no meaning or effect
RESET:
unaffected; always input port
PB7
$0001
PB6
PB5
PB4
PB3
PB2
PB1
PB0
PORTB
B7
B6
B5
B4
B3
B2
B1
B0
UUUUUUUU
RESET:
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