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AT697F bảng dữ liệu(PDF) 79 Page - ATMEL Corporation |
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AT697F bảng dữ liệu(HTML) 79 Page - ATMEL Corporation |
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79 / 155 page ![]() AT697F ADVANCE INFORMATION 79 7703C–AERO–6/09 The WIM can be read by the privileged RDWIM instruction and written by the WRWIM instruction. Table 32. Y Register - Y 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 y r/w xxxx xxxx The Y register can be read and written with the RDY and WRY instructions. Table 33. Trap Base Address - TBR 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 tba[19:0] tt[7:0] reserved r/w r r/w 0000 Bit Number Mnemonic Description 31..12 tba[19:0] Trap Base Address This field contains the most-significant 20 bits of the trap table address. 11..4 tt[7:0] Trap Type This eight-bit field is written by the hardware when a trap occurs, and retains its value until the next trap. It provides an offset into the trap table. The tba field is written by the WRTBR instruction. Use of WRTBR is don’t care for tt field. 4..0 cwp[4:0] comprise the current window pointer, a counter that identifies the current window into the r registers. The hardware decrements the CWP on traps and SAVE instructions, and increments it on RESTORE and RETT instructions (modulo NWINDOWS). Table 31. Window Invalid Mask - WIM 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 reserved windows 7 6 5 4 3 2 1 0 r r/w 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 Bit Number Mnemonic Description 0 < n < 7 windows[n] Indicated wether the window is a ‘valid’ or an ‘invalid’ one. ‘0’ : valid ‘1’ : invalid Bit Number Mnemonic Description |
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