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NSC800 Datasheet(PDF) 43 Page - National Semiconductor (TI) |
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NSC800 Datasheet(HTML) 43 Page - National Semiconductor (TI) |
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43 / 76 page  126 8-Bit Arithmetic (Continued) 76543210 0 0 1 1 0 1 0 1 DEC (HL) Timing M cycles 3 T states 11 (4 4 3) Addressing Mode Source Register Indexed Destination Register In- dexed 76 5 43210 DEC (IX a d) (for NX e 0) 11NX 11101 DEC (IY a d) (for NX e 1) 00 1 10101 d Timing M cycles 6 T states 23 (4 4 3 5 4 3) Addressing Mode Source Indexed Destination Indexed 127 16-Bit Arithmetic ADD ss pp Add the contents of the 16-bit register rp or pp to the con- tents of the 16-bit register ss ss w ss a rp S NA or Z NA ss w ss a pp H Set if carry from bit 11 PV NA N Reset C Set if carry from bit 15 76543210 0 0 rp 1 0 0 1 ADD HL rp Timing M cycles 3 T states 11 (4 4 3) Addressing Mode Source Register Destination Register 76 5 4 3210 ADD IX pp (for NX e 0) 11NX 11101 ADD IY pp (for NX e 1) 00 pp 1001 Timing M cycles 4 T states 15 (4 4 4 3) Addressing Mode Source Register Destination Register ADC HL pp The contents of the 16-bit register pp are added with the carry bit to the HL register HL w HL a pp a CY S Set if result is negative Z Set if result is zero H Set according to carry out of bit 11 PV Set if result exceeds 16-bit 2’s complement range N Reset C Set if carry out of bit 15 76543210 11101101 01 pp 1010 Timing M cycles 4 T states 15 (4 4 4 3) Addressing Mode Source Register Destination Register SBC HL pp Subtract with carry the contents of the 16-bit pp register from the 16-bit HL register HL w HL b pp b CY S Set if result is negative Z Set if result is zero H Set according to borrow from bit 12 PV Set if result exceeds 16-bit 2’s complement range N Set C Set according to borrow condi- tion 76543210 11101101 01 pp 0010 Timing M cycles 4 T states 15 (4 4 4 3) Addressing Mode Source Register Destination Register INC rr Increment the contents of the 16-bit register rr rr w rr a 1 No flags affected 76543210 INC BC 00 rp 0011 INC DE INC HL INC SP Timing M cycles 1 T states 6 Addressing Mode Register 76 5 4 3210 INC IX (for NXe0) 11NX 11101 INC IY (for NXe1) 00 1 0 0011 Timing M cycles 2 T states 10 (4 6) Addressing Mode Register 43 |
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