參數(shù)資料
型號(hào)： NS32FX100VF
廠商： National Semiconductor Corporation
英文描述： System Controller
中文描述： 系統(tǒng)控制器
文件頁(yè)數(shù)： 42/94頁(yè)
文件大小： 955K
代理商： NS32FX100VF
2.0 Architecture
(Continued)
with other modules, and are allocated by software. Input
pins can always be read, even if shared with another mod-
ule. Output pins can be enabled or disabled (TRI-STATE).
The characteristics of the four bits which may be associated
with the ports are as follows:
D DI:
Data In bit. Read only. Holds current value/state of
the pin.
D DO:
Data Out bit. Write/read. Holds the value to be
driven onto the pin when the respective MS bit is
‘‘0’’. When read back, DO is not effected by the
MS bit.
D EN:
Enable bit. Write/read. TRI-STATE when EN
e
0,
drive when EN
e
1.
Module Select bit. Write/read. Selects output pin
source and input pin destination.
When MS
e
0, pin is connected to the port.
When MS
e
1, pin is connected to the module
that shares this pin.
D MS:
When an input signal is assigned to a module (by setting the
respective MS bit to ‘‘1’’), the associated EN bit must be
cleared to ‘‘0’’.
TL/EE/11331–28
FIGURE 2-23. Port A
Two bits are associated with each input pin of this port:
DI: Data In Bit
MS: Module Select Bit
TL/EE/11331–29
FIGURE 2-24. Port B
Three bits are associated with each output pin of this port:
DO: Data Out Bit
EN: Enable Bit
MS: Module Select Bit
TL/EE/11331–30
FIGURE 2-25. Port C
42
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