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TNETV2685FIBZUT7 数据表(PDF) 43 Page - Texas Instruments |
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TNETV2685FIBZUT7 数据表(HTML) 43 Page - Texas Instruments |
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43 / 191 page  TMS320DM647 TMS320DM648 www.ti.com SPRS372H – MAY 2007 – REVISED APRIL 2012 3.2.5 KEY_REG (write protection) KEY_REG protects against accidental writes to certain system configuration registers. The complete set of registers protected by the KEY_REG is: • PINMUX • BOOTCFG • PRI_ALLOC • CFGPLL • CFGRX0 • CFGTX0 • CFGRX1 • CFGTX1 • MAC_ADDR_RW0 • MAC_ADDR_RW1 Writes to these registers are locked/blocked by default. To enable writes to these registers, write 0xADDDECAF to the KEY_REG. After enabling writes to protected registers by doing the above, the register writes should occur within 10000 CPU/6 cycles, after which the key will be reset. Figure 3-5. KEY_REG 31 0 KEY_REG W-0x00000000 LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Copyright © 2007–2012, Texas Instruments Incorporated Device Configuration 43 Submit Documentation Feedback Product Folder Link(s): TMS320DM647 TMS320DM648 |
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