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參數(shù)資料
| 型號： | HPC46003 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High-Performance microControllers |
| 中文描述： | 高性能微控制器 |
| 文件頁數(shù)： | 6/36頁 |
| 文件大?。?/td> | 467K |
| 代理商： | HPC46003 |
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PortsAB
The highly flexible A and B ports are similarly structured
The Port A (see
Figure 11 ) consists of a data register and a
direction register Port B (see
Figures 12 13 14 ) has an
alternate function register in addition to the data and direc-
tion registers All the control registers are readwrite regis-
ters
The associated direction registers allow the port pins to be
individually programmed as inputs or outputs Port pins se-
lected as inputs are placed in a TRI-STATE mode by reset-
ting corresponding bits in the direction register
A write operation to a port pin configured as an input causes
the value to be written into the data register a read opera-
tion returns the value of the pin Writing to port pins config-
ured as outputs causes the pins to have the same value
reading the pins returns the value of the data register
Primary and secondary functions are multiplexed onto Port
B through the alternate function register (BFUN) The sec-
ondary functions are enabled by setting the corresponding
bits in the BFUN register
TLDD8801 – 13
FIGURE 11 Port A IO Structure
TLDD8801 – 14
FIGURE 12 Structure of Port B Pins B0 B1 B2 B5 B6 and B7 (Typical Pins)
14
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