參數(shù)資料
型號： MC68HC05P18ACP
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)： 84/130頁
文件大小： 1310K
代理商： MC68HC05P18ACP
Input/Output (I/O) Ports
Port B
MC68HC05P18A
Technical Data
Input/Output (I/O) Ports
NON-DISCLOSURE
AGREEMENT
REQUIRED
7.4 Port B
Port B is a 3-bit bidirectional port that can share pins PB5–PB7 with the
serial input/output port (SIOP) communications subsystem. 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).
Port B may be used for general I/O applications when the SIOP
subsystem is disabled. The SPE bit in register SIOP control register
(SPCR) is used to enable/disable the SIOP subsystem. When the SIOP
subsystem is enabled, port B registers are still accessible to software.
Writing to either of the port B registers while a data transfer is under way
could corrupt the data. See Section 9. Serial Input/Output Ports
(SIOP) for a discussion of the SIOP subsystem.
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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