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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.
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