參數(shù)資料
型號: MC68HC705P9CDW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 145/160頁
文件大?。?/td> 2208K
代理商: MC68HC705P9CDW
Parallel Input/Output (I/O) Ports
Port B
MC68HC705P9 — Rev. 4.0
Technical Data
MOTOROLA
Parallel Input/Output (I/O) Ports
85
7.4 Port B
Port B is a 3-bit I/O port that shares its pins with the serial I/O port
(SIOP).
NOTE:
Do not use port B for general-purpose I/O while the SIOP is enabled.
7.4.1 Port B Data Register (PORTB)
The port B data register contains a latch for each of the three port B pins.
PB[7:5] — Port B Data Bits
These read/write bits are software programmable bits. Data direction
of each port B pin is under the control of the corresponding bit in data
direction register B. Reset has no effect on port B data.
NOTE:
Writing to data direction register B does not affect the data direction of
port B pins that are being used by the SIOP. However, data direction
register B always determines whether reading port B returns the states
of the latches or the states of the pins.
SCK — Serial Clock
When the SIOP is enabled, SCK is the SIOP clock output (in master
mode) or the SIOP clock input (in slave mode).
$0001
Bit 7
6
54321
Bit 0
Read:
PB7
PB6
PB5
00000
Write:
Reset:
Unaffected by reset
Alternate
Function:
SCK
SDI
SDO
= Unimplemented
Figure 7-5. Port B Data Register (PORTB)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)PDF資料
PDF描述
MC68HC705P9DW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705P9MS 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
MC68HC705P9CDW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
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