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| 型号： | TMX20F2810PBKAEP |
| 厂商： | Texas Instruments, Inc. |
| 元件分类： | 数字信号处理 |
| 英文描述： | Digital Signal Processors |
| 中文描述： | 数字信号处理器 |
| 文件页数： | 51/159页 |
| 文件大小： | 2084K |
| 代理商： | TMX20F2810PBKAEP |
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Functional Overview
51
March 2004 Revised October 2004
SGUS051A
3.8.1
Loss of Input Clock
In PLL enabled mode, if the input clock XCLKIN or the oscillator clock is removed or absent, the PLL will still
issue a “limp-mode” clock. The limp-mode clock will continue to clock the CPU and peripherals at a typical
frequency of 14 MHz. The PLLCR register should have been written to with a non-zero value for this feature
to work.
Normally, when the input clocks are present, the watchdog counter will decrement to initiate a watchdog reset
or WDINT interrupt. However, when the external input clock fails, the watchdog counter will stop decrementing
(i.e., the watchdog counter does not change with the limp-mode clock). This condition could be used by the
application firmware to detect the input clock failure and initiate necessary shut-down procedure for the
system.
3.9
PLL-Based Clock Module
The F281x and C281x have an on-chip, PLL-based clock module. This module provides all the necessary
clocking signals for the device, as well as control for low-power mode entry. The PLL has a 4-bit ratio control
to select different CPU clock rates. The watchdog module should be disabled before writing to the PLLCR
register. It can be re-enabled (if need be) after the PLL module has stabilized, which takes 131072 XCLKIN
cycles.
The PLL-based clock module provides two modes of operation:
Crystal-operation
This mode allows the use of an external crystal/resonator to provide the time base to the device.
External clock source operation
This mode allows the internal oscillator to be bypassed. The device clocks are generated from an external
clock source input on the X1/XCLKIN pin.
External Clock Signal
(Toggling 0VDD)
Cb1
(see Note A)
X2
X1/XCLKIN
X1/XCLKIN
X2
Crystal
Cb2
(see Note A)
(a)
(b)
NC
NOTE A: TI recommends that customers have the resonator/crystal vendor characterize the operation of their device with the DSP chip. The
resonator/crystal vendor has the equipment and expertise to tune the tank circuit. The vendor can also advise the customer regarding
the proper tank component values that will ensure start-up and stability over the entire operating range.
Figure 310. Recommended Crystal/Clock Connection
Table 315. Possible PLL Configuration Modes
PLL MODE
REMARKS
SYSCLKOUT
PLL Disabled
Invoked by tying XPLLDIS pin low upon reset. PLL block is completely
disabled. Clock input to the CPU (CLKIN) is directly derived from the clock
signal present at the X1/XCLKIN pin.
XCLKIN
PLL Bypassed
Default PLL configuration upon power-up, if PLL is not disabled. The PLL
itself is bypassed. However, the /2 module in the PLL block divides the clock
input at the X1/XCLKIN pin by two before feeding it to the CPU.
XCLKIN/2
PLL Enabled
Achieved by writing a non-zero value “n” into PLLCR register. The /2 module
in the PLL block now divides the output of the PLL by two before feeding it to
the CPU.
(XCLKIN * n) / 2
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