參數(shù)資料
型號： TMS320F2810GHHMEP
廠商： Texas Instruments, Inc.
元件分類： 數(shù)字信號處理
英文描述： Digital Signal Processors
中文描述： 數(shù)字信號處理器
文件頁數(shù)： 83/159頁
文件大?。?/td> 2084K
代理商： TMS320F2810GHHMEP
Peripherals
83
March 2004 Revised October 2004
SGUS051A
Figure 412 shows how the various register bits select the various modes of operation.
Peripheral I/O
MUX
0
1
MUX
1
0
PIN
Internal (Pullup or Pulldown)
Digital I/O
Boundary Off
XRS
High-Impedance
Enable (1)
High-
Impedance
Control
GPxDIR
Register Bit
GPxMUX
Register Bit
GPxQUAL
Register
GPxDAT/SET/CLEAR/TOGGLE
Register Bit(s)
Input Qualification
SYSCLKOUT
NOTES: A. In the GPIO mode, when the GPIO pin is configured for output operation, reading the GPxDAT data register only gives the value
written, not the value at the pin. In the peripheral mode, the state of the pin can be read through the GPxDAT register, provided the
corresponding direction bit is zero (input mode).
B. Some selected input signals are qualified by the SYSCLKOUT. The GPxQUAL register specifies the qualification sampling period.
The sampling window is 6 samples wide and the output is only changed when all samples are the same (all 0’s or all 1’s). This feature
removes unwanted spikes from the input signal.
Figure 412. Modes of Operation
NOTE:
The input function of the GPIO pin and the input path to the peripheral are always enabled.
It is the output function of the GPIO pin that is multiplexed with the output path of the primary
(peripheral) function. Since the output buffer of a pin connects back to the input buffer, any
GPIO signal present at the pin will be propagated to the peripheral module as well. Therefore,
when a pin is configured for GPIO operation, the corresponding peripheral functionality (and
interrupt-generating capability) must be disabled. Otherwise, interrupts may be inadvertently
triggered. This is especially critical when the PDPINTA and PDPINTB pins are used as GPIO
pins, since a value of zero for GPDDAT.0 or GPDDAT.5 (PDPINTx) will put PWM pins in a
high-impedance state. The CxTRIP and TxCTRIP pins will also put the corresponding PWM
pins in high impedance, if they are driven low (as GPIO pins)
and
bit EXTCONx.0 = 1.
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