參數(shù)資料
型號： MC68HC805K3DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PDSO16
封裝： SOIC-16
文件頁數(shù)： 83/119頁
文件大?。?/td> 2870K
代理商： MC68HC805K3DW
General Release Specication
I/O Port Programming
MC68HC805K3 — Rev. 1.0
66
Parallel Input/Output
7.4.4 Port B with 3-Pin RC Oscillator
The PB1/OSC3 pin may be used as an output from a 3-pin RC oscillator
when the mask option register bit for a 3-pin RC oscillator is used. In this
case, the following conditions apply:
The PB1 data register bit can be used as a read/write storage
location without affecting the oscillator. PB1 is unaffected by reset.
The DDRB1 data direction bit can be used as a read/write storage
location without affecting the oscillator. DDRB1 is cleared by
reset.
The software programmable pulldown on PB1/OSC3 is disabled,
regardless of the mask option register bit selection for the software
programmable pulldowns or the state of PDRB1.
7.5 I/O Port Programming
All I/O pins can be programmed as inputs or outputs, with or without
pulldown devices.
7.5.1 Pin Data Direction
The direction of a pin is determined by the state of its corresponding bit
in the associated port data direction register (DDR). A pin is configured
as an output if its corresponding DDR bit is set to a logic one. A pin is
configured as an input if its corresponding DDR bit is cleared to a logic
zero.
The data direction bits DDRB0, DDRB1, and DDRA0 through DDRA7
are read/write bits that can be manipulated with read-modify-write
instructions. At power-on or reset, all DDRs are cleared, which
configures all port pins as inputs. If the mask option register bit for
software programmable pulldowns is selected, all pins initially power-up
with their software programmable pulldowns enabled.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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