参数资料
型号: MC68HSC05K0P
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PDIP16
封装: PLASTIC, DIP-16
文件页数: 125/154页
文件大小: 1544K
代理商: MC68HSC05K0P
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)
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