CYWUSB6953_10 datasheet(14/68 Pages) CYPRESS

14 / 68 page

CYRF69103

Document #: 001-07611 Rev *F

Page 14 of 68

11.3 Index Register

11.4 Stack Pointer Register

11.5 CPU Program Counter High Register

11.6 CPU Program Counter Low Register

Table 11-3. CPU X Register (CPU_X)

Bit #

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 11-4. CPU Stack Pointer Register (CPU_SP)

Bit #

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 11-5. CPU Program Counter High Register (CPU_PCH)

Bit #

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 11-6. CPU Program Counter Low Register (CPU_PCL)

Bit #

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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