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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMS320VC549 датащи(PDF) 38 Page - Texas Instruments |
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TMS320VC549 датащи(HTML) 38 Page - Texas Instruments |
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38 / 111 page  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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