13 / 65 page
CYRF69103
Document #: 001-07611 Rev *C
Page 13 of 65
Index Register
Stack Pointer Register
CPU Program Counter High Register
CPU Program Counter Low Register
Table 8. CPU X Register (CPU_X)
Bit #
7
6
5
4
3
2
1
0
Field
X [7:0]
Read/Write
––––––––
Default
00000000
Bits 7:0
X [7:0]
8-bit data value holds an index for any instruction that uses an indexed addressing mode
Table 9. CPU Stack Pointer Register (CPU_SP)
Bit #
7
6
5
4
3
2
1
0
Field
Stack Pointer [7:0]
Read/Write
––––––––
Default
00000000
Bits 7:0
Stack Pointer [7:0]
8-bit data value holds a pointer to the current top-of-stack
Table 10. 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
Bits 7:0
Program Counter [15:8]
8-bit data value holds the higher byte of the program counter
Table 11. 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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