參數(shù)資料
型號： TMDXCNCD28069ISO
廠商： Texas Instruments
文件頁數(shù)： 121/174頁
文件大?。?/td> 0K
描述： EVAL PICCOLO CONTROLCARD
標(biāo)準(zhǔn)包裝： 1
系列： TMS320F2806x, Piccolo™, C2000™
主要目的： 接口，RS232，GPIO
嵌入式： 是，MCU，32 位
已用 IC / 零件： TMS320F2806x
已供物品： 板
SPRS698D – NOVEMBER 2010 – REVISED DECEMBER 2012
2.9.3
PLL-Based Clock Module
The devices 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 5-bit ratio control
PLLCR[DIV] to select different CPU clock rates. The watchdog module should be disabled before writing
to the PLLCR register. The watchdog module can be re-enabled (if need be) after the PLL module has
stabilized, which takes 1 ms. The input clock and PLLCR[DIV] bits should be chosen in such a way that
the output frequency of the PLL (VCOCLK) is at least 50 MHz.
Table 2-15. PLL Settings
SYSCLKOUT (CLKIN)
PLLCR[DIV] VALUE(1) (2)
PLLSTS[DIVSEL] = 0 or 1(3)
PLLSTS[DIVSEL] = 2
PLLSTS[DIVSEL] = 3
00000 (PLL bypass)
OSCCLK/4 (Default)(1)
OSCCLK/2
OSCCLK
00001
(OSCCLK * 1)/4
(OSCCLK * 1)/2
(OSCCLK * 1)/1
00010
(OSCCLK * 2)/4
(OSCCLK * 2)/2
(OSCCLK * 2)/1
00011
(OSCCLK * 3)/4
(OSCCLK * 3)/2
(OSCCLK * 3)/1
00100
(OSCCLK * 4)/4
(OSCCLK * 4)/2
(OSCCLK * 4)/1
00101
(OSCCLK * 5)/4
(OSCCLK * 5)/2
(OSCCLK * 5)/1
00110
(OSCCLK * 6)/4
(OSCCLK * 6)/2
(OSCCLK * 6)/1
00111
(OSCCLK * 7)/4
(OSCCLK * 7)/2
(OSCCLK * 7)/1
01000
(OSCCLK * 8)/4
(OSCCLK * 8)/2
(OSCCLK * 8)/1
01001
(OSCCLK * 9)/4
(OSCCLK * 9)/2
(OSCCLK * 9)/1
01010
(OSCCLK * 10)/4
(OSCCLK * 10)/2
(OSCCLK * 10)/1
01011
(OSCCLK * 11)/4
(OSCCLK * 11)/2
(OSCCLK * 11)/1
01100
(OSCCLK * 12)/4
(OSCCLK * 12)/2
(OSCCLK * 12)/1
01101
(OSCCLK * 13)/4
(OSCCLK * 13)/2
(OSCCLK * 13)/1
01110
(OSCCLK * 14)/4
(OSCCLK * 14)/2
(OSCCLK * 14)/1
01111
(OSCCLK * 15)/4
(OSCCLK * 15)/2
(OSCCLK * 15)/1
10000
(OSCCLK * 16)/4
(OSCCLK * 16)/2
(OSCCLK * 16)/1
10001
(OSCCLK * 17)/4
(OSCCLK * 17)/2
(OSCCLK * 17)/1
10010
(OSCCLK * 18)/4
(OSCCLK * 18)/2
(OSCCLK * 18)/1
(1)
The PLL control register (PLLCR) and PLL Status Register (PLLSTS) are reset to their default state by the XRS signal or a watchdog
reset only. A reset issued by the debugger or the missing clock detect logic has no effect.
(2)
This register is EALLOW protected. See the "Systems Control and Interrupts" chapter of the TMS320x2806x Piccolo Technical
Reference Manual (literature number SPRUH18) for more information.
(3)
By default, PLLSTS[DIVSEL] is configured for /4. (The boot ROM changes this to /1.) PLLSTS[DIVSEL] must be 0 before writing to the
PLLCR and should be changed only after PLLSTS[PLLLOCKS] = 1.
Table 2-16. CLKIN Divide Options
PLLSTS [DIVSEL]
CLKIN DIVIDE
0
/4
1
/4
2
/2
3
/1
50
Device Overview
Copyright 2010–2012, Texas Instruments Incorporated
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