參數(shù)資料
型號: TMS320LC542-40
元件分類: 數(shù)字信號處理
英文描述: Digital Signal Processor
中文描述: 數(shù)字信號處理器
文件頁數(shù): 33/111頁
文件大?。?/td> 1426K
代理商: TMS320LC542-40
TMS320C54x, TMS320LC54x, TMS320VC54x
FIXED-POINT DIGITAL SIGNAL PROCESSORS
SPRS039C – FEBRUARY 1996 – REVISED DECEMBER 1999
33
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
software-programmable PLL (’545A, ’546A, ’548, and ’549) (continued)
Bits 15–12
PLLMUL. PLL multiplier. Defines the frequency multiplier in conjunction with PLLDIV and
PLLNDIV, as shown in Table 5.
Bit 11
PLLDIV. PLL divider. Defines the frequency multiplier in conjunction with PLLMUL and PLLNDIV,
as shown in Table 5.
0 = an integer multiply factor is used.
1 = a non-integer multiply factor is used.
Bits 10–3
PLLCOUNT. PLL counter value. Specifies the number of input clock cycles (in increments of
16 cycles) for the PLL lock timer to count before the PLL begins clocking the processor after the
PLL is started. The PLL counter is a down-counter, which is driven by the input clock divided
by 16; therefore, for every 16 input clocks, the PLL counter decrements by one.
The PLL counter can be used to ensure that the processor is not clocked until the PLL is locked,
so that only valid clock signals are sent to the device.
Bit 2
PLLON/OFF. PLL on/off. Enables or disables the PLL part of the clock generator in conjunction
with the PLLNDIV bit. Note that PLLON/OFF and PLLNDIV can both force the PLL to run; when
PLLON/OFF is high, the PLL runs independently of the state of PLLNDIV.
PLLON/OFF
PLLNDIV
PLL STATE
0
0
Off
1
0
On
0
1
On
1
1
On
Bit 1
PLLNDIV. PLL clock generator select. Determines whether the clock generator works in PLL
mode or in divider (DIV) mode, thereby defining the frequency multiplier in conjunction with
PLLMUL and PLLDIV.
0 = Divider mode is used
1 = PLL mode is used
Bit 0
PLLSTATUS. PLL status. Indicates the mode in which the clock generator is operating.
0 = DIV mode
1 = PLL mode
Table 5. PLL Multiplier Ratio as a Function of PLLNDIV, PLLDIV, and PLLMUL
PLLNDIV
PLLDIV
PLLMUL
MULTIPLIER
0
x
0–14
0.5
0
x
15
0.25
1
0
0–14
PLLMUL + 1
1
0
15
Reserved
1
1
0 or even
(PLLMUL + 1)
2
1
1
odd
PLLMUL
4
CLKOUT = CLKIN x multiplier
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