參數(shù)資料
型號: MC68HC05P1AP
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, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 78/124頁
文件大?。?/td> 3724K
代理商: MC68HC05P1AP
Input/Output Ports
Port B
MC68HC05P1A Rev. 3.0
General Release Specification
Input/Output Ports
NON-DISCLOSURE
AGREEMENT
REQUIRED
7.4 Port B
Port B is a 3-bit bidirectional port that does not share any of its pins with
other subsystems. The port B data register is located at address $0001
and its data direction register (DDR) is located at address $0005. Reset
does not affect the data registers but clears the DDRs, thereby setting
all of the port pins to input mode. Writing a 1 to a DDR bit sets the
corresponding port pin to output mode (see Figure 7-2).
Figure 7-2. Port B I/O Circuitry
READ $0001
WRITE $0001
READ $0005
DATA
REGISTER BIT
I/O
PIN
OUTPUT
INTERNAL HC05
DATA BUS
RESET
(RST)
WRITE $0005
DATA
DIRECTION
REGISTER BIT
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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