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NSC800N Datasheet(PDF) 57 Page - National Semiconductor (TI) |
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NSC800N Datasheet(HTML) 57 Page - National Semiconductor (TI) |
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57 / 76 page  1214 Program Control (Continued) RETN Unconditional return from non-maskable interrupt handling subroutine Functionally similar to RET instruction except interrupt enable state is restored to that prior to non-mask- able interrupt PCL w (SP) No flags affected PCH w (SP a 1) SP w SP a 2 IFF1 w IFF2 76543210 11101101 01000101 Timing M cycles 4 T states 14 (4 4 3 3) Addressing Mode Register Indirect RESTARTS RST P The present contents of the PC are pushed onto the memo- ry stack and the PC is loaded with dedicated program loca- tions as determined by the specific restart executed (SP b 1) w PCH No flags affected (SP b 2) w PCL SP w SP b 2 PCH w 0 PCL w P 76543210 1 1t1 1 1 Timing M cycles 3 T states 11 (5 3 3) Addressing Mode Modified Page Zero p 00H 08H 10H 18H 20H 28H 30H 38H t 000 001 010 011 100 101 110 111 57 |
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