参数资料
型号: HPC46083
厂商: National Semiconductor Corporation
英文描述: High-Performance microControllers
中文描述: 高性能微控制器
文件页数: 6/36页
文件大小: 467K
代理商: HPC46083
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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