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參數資料
型號: TMX320F2810PBKA
廠商: Texas Instruments, Inc.
元件分類: 數字信號處理
英文描述: DIGITAL SIGNAL PROCESSORS
中文描述: 數字信號處理器
文件頁數: 49/103頁
文件大小: 1341K
代理商: TMX320F2810PBKA
TMS320F2810, TMS320F2812
DIGITAL SIGNAL PROCESSORS
SPRS174B
APRIL 2001
REVISED SEPTEMBER 2001
49
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251
1443
OSC and PLL block
The OSC and PLL block on the F2810 and F2812 will use a zero-pin Phase-Locked Loop (ZPLL). Figure 10
shows the implemented features and relevant signals.
XPLLDIS
XTAL2
XTAL1/CLKIN
On-Chip
Oscillator
(OSC)
4-bit
PLL Select
PLL
Bypass
/2
PLL
OSCCLK
Figure 10. OSC and PLL Block
The OSC circuit enables a crystal to be attached to the F2810 and F2812 devices using the X1 and X2 pins.
If a crystal is not used, then an external oscillator can be directly connected to the XCLKIN pin and the X2 pin
is left unconnected. The oscillator input range is 20 MHz to 35 MHz.
Table 36. PLLCR Register Bit Definitions
BIT(S)
NAME
TYPE
XRS RESET
DESCRIPTION
3:0
DIV
R/W
0,0,0,0
These bits set the PLL clocking ratio. The range of values should be between
(x 1.0) to (x 10.0). The scale between these values should be as linear as
possible:
0000
x 0.5
PLL bypassed but enabled
CLKIN = OSCCLK / 2
PLL connected
CLKIN (OSCCLK * 1.0) / 2
CLKIN = (OSCCLK * 2.0) / 2
CLKIN = (OSCCLK * 3.0) / 2
CLKIN = (OSCCLK * 4.0) / 2
CLKIN = (OSCCLK * 5.0) / 2
CLKIN = (OSCCLK * 6.0) / 2
CLKIN = (OSCCLK * 7.0) / 2
CLKIN = (OSCCLK * 8.0) / 2
CLKIN = (OSCCLK * 9.0) / 2
CLKIN = (OSCCLK * 10.0) / 2
0001
x 1.0
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
x 2.0
x 3.0
x 4.0
x 5.0
x 6.0
x 7.0
x 8.0
x 9.0
x 10.0
spare
spare
spare
spare
spare
15:4
reserved
R=0
0:0
The PLLCR register is reset to a known state by the XRS reset line. If a reset is issued by the debugger, the PLL clocking ratio is not changed.
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