參數(shù)資料
型號: DSP16210
英文描述: TVS 400W 6.5V UNIDIRECT SMA
中文描述: DSP16210數(shù)字信號處理器
文件頁數(shù): 68/173頁
文件大小: 2621K
代理商: DSP16210
Data Sheet
July 2000
DSP16210 Digital Signal Processor
68
DRAFT COPY
Lucent Technologies Inc.
Hardware Architecture
(continued)
Power Management
(continued)
Software Stop, PLL Disabled and Not Selected
. The PLL is enabled to run at 100 MHz, assuming a constant
CKI input clock of 10 MHz. Prior to performing a software stop by setting the NOCK bit (
powerc
[9]), the program
reduces power by turning off all the peripherals, holding the CKO pin low, and disabling the PLL. Because the PLL
is disabled (powered down) during software stop, it does not dissipate power. The device restarts with CKI as the
internal clock before the program reselects the PLL clock. After coming out of software stop, the program must
enable the PLL and wait for it to lock before reselecting it.
di
pllc=0xa9f2
/* Globally disable interrupts for PLL lock.
/* pllc[15]=1 enables the PLL to run at 100 MHz
/* with CKI=10 MHz. CKI must remain running.
/* Assure time for PLL to lock
if lock goto select_pll
goto pll_buzz
select_pll: pllc=0xe9f2
/* pllc[14]=1 selects the PLL.
ei
/* Globally re-enable interrupts.
.
.
/* user code with CLK = 100 MHz
.
pllc=0x29f2
/* Prepare for stop--deselect and disable PLL...
powerc=0x189f
/* (select CKI), set INT0EN, turn off peripherals.
2*nop
/* Wait for it to take effect.
di
inc0=NO_INT0
/* Disable the INT0 interrupt (Clear inc0[11:10]).
ei
ioc = 0x0040
/* Hold CKO low.
_nock:
powerc=0x1e9f
/* Set NOCK to stop internal clock.
/* Minimum switching power consumed here.
3*nop
/* Some nops are needed.
/* INT0 pin clears the NOCK bit; clocking resumes.
cont:
...
/* User code executes here.
powerc=0x0000
/* Clear INT0EN bit, select high-speed clock,
/* turn on peripherals
2*nop
/* Wait for it to take effect
ins 0x0020
/* Clear the INT0 status bit.
di
/* Globally disable interrupts for PLL lock...
inc0=INT0
/* and inc0 change. Safe to reenable INT0.
pllc=0xa9f2
/* pllc[15]=1 enables the PLL to run at 100 MHz.
pll_buzz2:
/* Assure time for PLL to lock
if lock goto select_pll2
goto pll_buzz2
select_pll2:pllc=0xe9f2
/* pllc[14]=1 selects the PLL.
ei
/* Globally re-enable interrupts.
ioc=0x0000
/* CKO is free-running PLL clock.
*/
*/
*/
*/
pll_buzz:
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
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