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Arlet 65C02 WIP: Implement INC A, DEC A

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Change-Id: Ia23480b061278092e328682370b1a545990c9e17
This commit is contained in:
David Banks
2016-08-01 11:56:41 +01:00
parent 7418b64cd9
commit d7fdd129b1
1 changed files with 6 additions and 3 deletions
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9
cpu_65c02.v
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@@ -984,14 +984,14 @@ always @(posedge clk)
always @(posedge clk) always @(posedge clk)
if( state == DECODE && RDY ) if( state == DECODE && RDY )
casex( IR ) casex( IR )
8'b0xx01010, // ASLA, ROLA, LSRA, RORA 8'b0xxx1010, // ASLA, INCA, ROLA, DECA, LSRA, PHY, RORA, PLY
8'b0xxxxx01, // ORA, AND, EOR, ADC 8'b0xxxxx01, // ORA, AND, EOR, ADC
8'b100x10x0, // DEY, TYA, TXA, TXS 8'b100x10x0, // DEY, TYA, TXA, TXS
8'b1010xxx0, // LDA/LDX/LDY 8'b1010xxx0, // LDA/LDX/LDY
8'b10111010, // TSX 8'b10111010, // TSX
8'b1011x1x0, // LDX/LDY 8'b1011x1x0, // LDX/LDY
8'b11001010, // DEX 8'b11001010, // DEX
8'bx1x11010, // PHY, PLY, PHX, PLX 8'b11x11010, // PHX, PLX
8'b1x1xxx01, // LDA, SBC 8'b1x1xxx01, // LDA, SBC
8'bxxx01000: // PHP, PLP, PHA, PLA, DEY, TAY, INY, INX 8'bxxx01000: // PHP, PLP, PHA, PLA, DEY, TAY, INY, INX
load_reg <= 1; load_reg <= 1;
@@ -1090,6 +1090,7 @@ always @(posedge clk )
always @(posedge clk ) always @(posedge clk )
if( state == DECODE && RDY ) if( state == DECODE && RDY )
casex( IR ) casex( IR )
8'b0001_1010, // INCA
8'b111x_x110, // INC 8'b111x_x110, // INC
8'b11x0_1000: // INX, INY 8'b11x0_1000: // INX, INY
inc <= 1; inc <= 1;
@@ -1158,7 +1159,8 @@ always @(posedge clk )
always @(posedge clk ) always @(posedge clk )
if( state == DECODE && RDY ) if( state == DECODE && RDY )
casex( IR ) casex( IR )
8'b00xx_xx10: // ROL, ASL 8'b00xx_x110, // ROL, ASL
8'b00x0_1010: // ROL, ASL
op <= OP_ROL; op <= OP_ROL;
8'b0010_x100: // BIT zp/abs 8'b0010_x100: // BIT zp/abs
@@ -1167,6 +1169,7 @@ always @(posedge clk )
8'b01xx_xx10: // ROR, LSR 8'b01xx_xx10: // ROR, LSR
op <= OP_A; op <= OP_A;
8'b0011_1010, // DEC A
8'b1000_1000, // DEY 8'b1000_1000, // DEY
8'b1100_1010, // DEX 8'b1100_1010, // DEX
8'b110x_x110, // DEC 8'b110x_x110, // DEC