参数资料
型号: MC68HC05P9AMDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 128/158页
文件大小: 3885K
代理商: MC68HC05P9AMDW
Parallel I/O Ports
Port B
Parallel I/O Ports
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).
SDI — Serial Data Input
When the SIOP is enabled, SDI is the SIOP data input.
SDO — Serial Data Output
When the SIOP is enabled, SDO is the SIOP data output.
Data Direction
Register B (DDRB)
Data direction register B determines whether each port B pin is an input
or an output.
NOTE:
Enabling and then disabling the SIOP configures data direction register
B for SIOP operation and can also change the port B data register. After
disabling the SIOP, initialize data direction register B and the port B data
register as your application requires.
DDRB[7:5] — Data Direction Register B Bits
These read/write bits control port B data direction. Reset clears
DDRB[7:5], configuring all three port B pins as inputs.
1 = Corresponding port B pin configured as output
0 = Corresponding port B pin configured as input
NOTE:
Avoid glitches on port B pins by writing to the port B data register before
changing data direction register B bits from 0 to 1.
Figure 34 shows the I/O logic of port B.
$0005
Bit 7
654321
Bit 0
Read:
DDRB7
DDRB6
DDRB5
00000
Write:
Reset:
00000000
= Unimplemented
Figure 33. Data Direction Register B (DDRB)
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