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Document 38-16016 Rev. *E Page 9 of 68
9.1.1 Accumulator Register
9.1.2 Index Register
9.1.3 Stack Pointer Register
9.1.4 CPU Program Counter High Register
9.1.5 CPU Program Counter Low Register
Table 9-2. CPU Accumulator Register (CPU_A)
Bit # 7 6 5 4 3 2 1 0
Field CPU Accumulator [7:0]
Read/Write ––––––––
Default 00000000
Bit [7:0]: CPU Accumulator [7:0]
8-bit data value holds the result of any logical or arithmetic instruction that uses a source addressing mode.
Table 9-3. 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 9-4. 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-stack.
Table 9-5. 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 9-6. 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.
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