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參數(shù)資料
| 型號： | HPC-DEV-SYS4-E |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Category 5e Cable Assembly; Connector Type A:RJ45 Plug; Connector Type B:RJ45 Plug; Cable Length:3m; Color:Black; Features:IP20 Rated RoHS Compliant: Yes |
| 中文描述： | 高性能微控制器/數(shù) |
| 文件頁數(shù)： | 13/39頁 |
| 文件大小： | 430K |
| 代理商： | HPC-DEV-SYS4-E |
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Connection Diagram
TL/DD/9682–45
Top View
Order Number HPC46064XXX/F20, HPC46064XXX/F30,
HPC46004VF20 or HPC46004VF30
See NS Package Number VF80B
Ports A & B
The highly flexible A and B ports are similarly structured.
The Port A (seeFigure 11 ) consists of a data register and a
direction register. Port B (seeFigures 12, 13 and14) has an
alternate function register in addition to the data and direc-
tion registers. All the control registers are read/write 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.
13
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