參數(shù)資料
型號: MC68HC05K1CDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 125/154頁
文件大小: 1544K
代理商: MC68HC05K1CDW
Technical Data
MC68HC05K0 MC68HC05K1 — Rev. 2.0
72
Parallel Input/Output (I/O)
MOTOROLA
Technical Data
7.4.2 Data Direction Register B
The contents of data direction register B (DDRB) determine whether
each port B pin is an input or an output (see Figure 7-6). Writing a logic 1
to a DDRB bit enables the output buffer for the associated port B pin; a
logic 0 disables the output buffer. A reset initializes all DDRB bits to
logic 0, configuring all port B pins as inputs. Setting a DDRB bit to a
logic 1 turns off the pulldown device for that pin.
DDRB1 and DDRB0 — Data Direction Bits 1 and 0
These read/write bits control port B data direction.
1 = Corresponding port B pin configured as output
0 = Corresponding port B pin configured as input
Bit 7–2 — Not used
Bits 7–2 always read as logic 0s. Writes to these bits have no effect.
NOTE:
Avoid glitches on port B pins by writing to the port B data register before
changing DDRB bits from logic 0 to logic 1.
Address:
$0005
Bit 7
654321
Bit 0
Read:
000000
DDRB1
DDRB0
Write:
Reset:
00000000
= Unimplemented
Figure 7-6. Data Direction Register B (DDRB)
相關(guān)PDF資料
PDF描述
MC68HC05K3CDW 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO16
MC68HC05K3CSD 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO16
MC68HC05K3P 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP16
MC68HC05K3CSDR2 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO20
MC68HC05K3CDWR2 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC05K1CP 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05K1DW 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05K1P 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05K1VDW 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05K1VP 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit