参数资料
型号: TMS320C542PGE-40
厂商: TEXAS INSTRUMENTS INC
元件分类: 数字信号处理
英文描述: 16-BIT, 100 MHz, OTHER DSP, PQFP144
封装: PLASTIC, QFP-144
文件页数: 44/111页
文件大小: 1467K
代理商: TMS320C542PGE-40
TMS320C54x, TMS320LC54x, TMS320VC54x
FIXED-POINT DIGITAL SIGNAL PROCESSORS
SPRS039C – FEBRUARY 1996 – REVISED DECEMBER 1999
38
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
considerations when using IDLE1/IDLE2/IDLE3 (continued)
STM
#0b, CLKMD
;switch to DIV mode
TstStatu:
LDM
CLKMD, A
AND
#01b, A
;poll STATUS bit
BC
TstStatu, ANEQ
STM
#0b, CLKMD
;reset PLLON_OFF when STATUS
;is DIV mode
IDLE3
(After IDLE3 wake-up – switch the PLL from DIV mode to PLL
3 mode)
STM
#0010001000000111b, CLKMD
;PLLCOUNT = 64 (decimal)
PLL considerations when using the bootloader
The ROM on the ’545A and ’546A contains a bootloader program that can be used to load programs into RAM
for execution following reset. When using this bootloader with the software-programmable PLL, several
considerations are important for proper system operation.
On the ’545A and ’546A, for compatibility, the bootloader configures the PLL to the same mode as would have
resulted if the same CLKMD1–3 input bits had been provided to the option-1 or option-2
hardware-programmable PLL (see Table 4), according to whether the ’545A or ’546A is an option-1 or option-2
device. Once the bootloader program has finished executing, and control is transferred to the user’s program,
the PLL can be reprogrammed to any desired configuration.
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