温度控制设计要求及程序

r1 = [P_IOA_Data]; // get key data from IOA //r1 = [P_IOB_Data]; // get key data from IOB r1 &= 0x000F; //

r2 = r1; // key from +Vcc r3 = r2 xor 0xffff; // Be a +Vcc mask

// delay here nop; nop; nop;

r1 = [P_IOA_Buffer]; // PortA.7 high(scan line) r1 |= 0x0080; // [P_IOA_Buffer] = r1; //

r1 = [P_IOA_Data]; //

//r1 = [P_IOB_Data]; // get key data from IOB r1 &= 0x000F; //

r1 ^= r2; // possible bits by scan line r1 &= r3; // do +Vcc mask

r1 = r1 lsl 4; // r1 |= r2; // //r2 = r2 lsl 4; //

//r1 |= r2; //

r1 = r1 and 0xFF; // mask bit[0..7] r2 = [R_DebounceReg]; // [R_DebounceReg] = r1; // cmp r2,[R_DebounceReg]; // je L_KS_StableTwoSample_2; //

r1 = C_DebounceCnt; //debounce time setting [R_DebounceCnt] = r1; // retf; //

L_KS_StableTwoSample_2:

r1 = [R_DebounceCnt]; // jz L_KS_StableOverDebounce_2; // retf;

L_KS_StableOverDebounce_2:

[R_DebounceCnt] = r1; // r2 = [R_DebounceReg]; // r1 = [R_KeyBuf]; //

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[R_KeyBuf] = r2; // r1 = r1 xor 0x00ff; // r1 = r1 and [R_KeyBuf]; // r1 = r1 and 0x00ff; // r1 = r1 or [R_KeyStrobe]; // [R_KeyStrobe] = r1; //save stable key code to R_KeyStrobe retf;

////////////////////////////////////////////////////////////////// // Function: debounce counter down count

////////////////////////////////////////////////////////////////// F_Key_DebounceCnt_Down:

r1 = [R_DebounceCnt]; // Debounce subroutine for F_IO_Key_Scan:

jz L_DebounceCntZero; // stop count if zero r1 -= 0x0001; // [R_DebounceCnt] = r1; // L_DebounceCntZero: // retf; //

//**************************************************************** // Function: Get Keycode for I/O Port // Destory register: r1, r2

//**************************************************************** _SP_GetCh: F_SP_GetCh:

//push BP,BP to [SP]; //BP = SP + 1;

r1 = [R_KeyStrobe]; // Get Key code

r2 = 0x0000; // Clear KeyStrobe for next key [R_KeyStrobe] = r2; // //pop BP,BP from [SP]; retf;

//======================================================================================== // End of key.asm

//====================================================================================

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