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參數(shù)資料
| 型號： | HPC467064 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High-Performance microController with a 16k UV Erasable CMOS EPROM |
| 中文描述： | 高性能的16K的紫外線可擦除的CMOS存儲器微控制器 |
| 文件頁數(shù)： | 13/34頁 |
| 文件大?。?/td> | 415K |
| 代理商： | HPC467064 |
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Connection Diagram
TL/DD/11046–17
Top View
Order Number HPC167064, EL
See NS Package Number EL68C
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 thruFigure 14) has
an alternate function register in addition to the data and
direction registers. All the control registers are read/write
registers.
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.
TL/DD/11046–19
FIGURE 11. Port A: I/O Structure
13
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