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CY7C638XX Datasheet(PDF) 9 Page - Cypress Semiconductor |
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CY7C638XX Datasheet(HTML) 9 Page - Cypress Semiconductor |
9 / 83 page CY7C63310, CY7C638xx Document 38-08035 Rev. *K Page 9 of 83 7.2 Addressing Modes 7.2.1 Source Immediate The result of an instruction using this addressing mode is placed in the A register, the F register, the SP register, or the X register, which is specified as part of the instruction opcode. Operand 1 is an immediate value that serves as a source for the instruction. Arithmetic instructions require two sources; the second source is the A or the X register specified in the opcode. Instructions using this addressing mode are two bytes in length. Examples Table 7-3. CPU X Register (CPU_X) Bit # 7 6 5 4 3 2 1 0 Field X [7:0] Read/Write –––––––– Default 00000000 Bit [7:0]: X [7:0] 8-bit data value holds an index for any instruction that uses an indexed addressing mode. Table 7-4. CPU Stack Pointer Register (CPU_SP) Bit # 7 6 5 4 3 2 1 0 Field Stack Pointer [7:0] Read/Write –––––––– Default 00000000 Bit [7:0]: Stack Pointer [7:0] 8-bit data value holds a pointer to the current top of the stack. Table 7-5. CPU Program Counter High Register (CPU_PCH) Bit # 7 6 5 4 3 2 1 0 Field Program Counter [15:8] Read/Write –––––––– Default 00000000 Bit [7:0]: Program Counter [15:8] 8-bit data value holds the higher byte of the program counter. Table 7-6. CPU Program Counter Low Register (CPU_PCL) Bit # 7 6 5 4 3 2 1 0 Field Program Counter [7:0] Read/Write –––––––– Default 00000000 Bit [7:0]: Program Counter [7:0] 8-bit data value holds the lower byte of the program counter. Table 7-7. Source Immediate Opcode Operand 1 Instruction Immediate Value ADD A 7 The immediate value of 7 is added with the Accumulator and the result is placed in the Accumulator. MOV X 8 The immediate value of 8 is moved to the X register. AND F 9 The immediate value of 9 is logically ANDed with the F register and the result is placed in the F register. [+] Feedback [+] Feedback |
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