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參數(shù)資料
| 型號： | TMS320LF2407PZA |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | DSP CONTROLLERS |
| 中文描述： | DSP控制器 |
| 文件頁數(shù)： | 51/115頁 |
| 文件大?。?/td> | 1511K |
| 代理商： | TMS320LF2407PZA |
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SPRS094I APRIL 1999 REVISED SEPTEMBER 2003
51
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
digital I/O and shared pin functions
The 240x has up to 41 general-purpose, bidirectional, digital I/O (GPIO) pins—most of which are shared
between primary functions and I/O. Most I/O pins of the 240x are shared with other functions. The digital I/O
ports module provides a flexible method for controlling both dedicated I/O and shared pin functions. All I/O and
shared pin functions are controlled using eight 16-bit registers. These registers are divided into two types:
Output Control Registers — used to control the multiplexer selection that chooses between the primary
function of a pin or the general-purpose I/O function.
Data and Control Registers — used to control the data and data direction of bidirectional I/O pins.
description of shared I/O pins
The control structure for shared I/O pins is shown in Figure 13, where each pin has three bits that define its
operation:
Mux control bit — this bit selects between the primary function (1) and I/O function (0) of the pin.
I/O direction bit — if the I/O function is selected for the pin (mux control bit is set to 0), this bit determines
whether the pin is an input (0) or an output (1).
I/O data bit — if the I/O function is selected for the pin (mux control bit is set to 0) and the direction selected
is an input, data is read from this bit; if the direction selected is an output, data is written to this bit.
The mux control bit, I/O direction bit, and I/O data bit are in the I/O control registers.
Pin
(Read/Write)
IOP Data Bit
In
Out
0 = Input
1 = Output
0
1
MUX Control Bit
0 = I/O Function
1 = Primary Function
IOP DIR Bit
Primary
Function
or I/O Pin
Pullup
or
Pulldown
(Internal)
Primary
Function
(Output Section)
Primary
Function
(Input Section)
Figure 13. Shared Pin Configuration
A summary of shared pin configurations and associated bits is shown in Table 12.
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