Does anyone know what C-code source, header or library file gets compiled to generate the following memory initialization code using a Program Counter (PC) data table for the 8051? And what is the purpose and intended function of this table--how is it commonly used?
i have been reading thru various different .A51 files for comparison purposes and noticed that this code is nearly always identically found in any set of application programs. It made me think this table is generated by the compiler to perform some function, but what?
for example the PC table is found at x045B below:
L0006: 042B E4 CLR A 042C 93 MOVC A, @A+DPTR 042D A3 INC DPTR 042E F8 MOV R0, A L0014: 042F E4 CLR A 0430 93 MOVC A, @A+DPTR 0431 A3 INC DPTR 0432 4003 JC L0012 0434 F6 MOV @R0, A 0435 8001 SJMP L0013 L0012: 0437 F2 MOVX @R0, A L0013: 0438 08 INC R0 0439 DFF4 DJNZ R7, L0014 043B 8029 SJMP L0009 L0007: 043D E4 CLR A 043E 93 MOVC A, @A+DPTR 043F A3 INC DPTR 0440 F8 MOV R0, A 0441 5407 ANL A, #7h 0443 240C ADD A, #0Ch 0445 C8 XCH A, R0 0446 C3 CLR C 0447 33 RLC A 0448 C4 SWAP A 0449 540F ANL A, #0Fh 044B 4420 ORL A, #20h 044D C8 XCH A, R0 044E 83 MOVC A, @A+PC 044F 4004 JC L0010 0451 F4 CPL A 0452 56 ANL A, @R0 0453 8001 SJMP L0011 L0010: 0455 46 ORL A, @R0 L0011: 0456 F6 MOV @R0, A 0457 DFE4 DJNZ R7, L0007 0459 800B SJMP L0009 045B 01 DB 001h 045C 02 DB 002h 045D 04 DB 004h 045E 08 DB 008h 045F 10 DB 010h 0460 20 DB 020h 0461 40 DB 040h 0462 80 DB 080h L0003: 0463 900B5F MOV DPTR, #0B5Fh L0009: 0466 E4 CLR A 0467 7E01 MOV R6, #1h 0469 93 MOVC A, @A+DPTR 046A 60BC JZ L0004 046C A3 INC DPTR 046D FF MOV R7, A 046E 543F ANL A, #3Fh 0470 30E509 JNB ACC.5, L0005 0473 541F ANL A, #1Fh 0475 FE MOV R6, A 0476 E4 CLR A 0477 93 MOVC A, @A+DPTR 0478 A3 INC DPTR 0479 6001 JZ L0005 047B 0E INC R6 L0005: 047C CF XCH A, R7 047D 54C0 ANL A, #0C0h 047F 25E0 ADD A, ACC 0481 60A8 JZ L0006 0483 40B8 JC L0007 0485 E4 CLR A 0486 93 MOVC A, @A+DPTR 0487 A3 INC DPTR 0488 FA MOV R2, A 0489 E4 CLR A 048A 93 MOVC A, @A+DPTR 048B A3 INC DPTR 048C F8 MOV R0, A L0008: 048D E4 CLR A 048E 93 MOVC A, @A+DPTR 048F A3 INC DPTR 0490 C8 XCH A, R0 0491 C582 XCH A, DPL 0493 C8 XCH A, R0 0494 CA XCH A, R2 0495 C583 XCH A, DPH 0497 CA XCH A, R2 0498 F0 MOVX @DPTR, A 0499 A3 INC DPTR 049A C8 XCH A, R0 049B C582 XCH A, DPL 049D C8 XCH A, R0 049E CA XCH A, R2 049F C583 XCH A, DPH 04A1 CA XCH A, R2 04A2 DFE9 DJNZ R7, L0008 04A4 DEE7 DJNZ R6, L0008 04A6 80BE SJMP L0009
Thank you, kenneth
Does anyone know what C-code source, header or library file gets compiled to generate the following memory initialization code neither it is generated from scratch
hat is the purpose and intended function of this table how else would something like
void main (void { unsigned char whatever = 7;
get 'whatever' initialized to 7
--how is it commonly used? it is automatically included