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NSC800D Datasheet(PDF) 27 Page - National Semiconductor (TI) |
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NSC800D Datasheet(HTML) 27 Page - National Semiconductor (TI) |
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27 / 76 page  110 Addressing Modes (Continued) 119 MODIFIED PAGE ZERO A subset of NSC800 instructions (the Restart instructions) provides a code-efficient single-byte instruction that allows CALLs to be performed to any one of eight dedicated loca- tions in page zero (locations X’0000 to X’00FF) Normally a CALL is a 3-byte instruction employing direct memory ad- dressing Example Instruction Perform a restart call to location X’0028 Mnemonic RST X’28 Opcode TLC5171 – 55 p 00H 08H 10H 18H 20H 28H 30H 38H t 000 001 010 011 100 101 110 111 Program execution continues at location X’0028 after exe- cution of a single-byte call employing modified page zero addressing 1110 BIT The NSC800 allows setting resetting and testing of individ- ual bits in registers and memory data bytes Example Operation Set bit 2 in the L register Mnemonic SET 2L Opcode TLC5171 – 56 Bit addressing allows the selection of bit 2 in the L register selected by register addressing 27 |
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