Maxim Integrated DS4830 Optical Microcontroller - Manual (Page 30)

DS4830 User’s Guide
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3.22 General Register High Byte (GRH, Eh[9h])
Initialization: This register is cleared to 00h on all forms of reset.
Access: Unrestricted direct read/write access.
BIT DESCRIPTION
7:0
This register reflects the high byte of the GR register and is intended primarily for supporting byte operations on 16-bit data.
Any data written to the GRH register will also be stored in the high byte of the GR register.
3.23 General Register Sign Extended Low Byte (GRXL, Eh[Ah])
Initialization: This register is cleared to 0000h on all forms of reset.
Access: Unrestricted direct read-only access.
BIT DESCRIPTION
15:0 This register provides the sign extended low byte of GR as a 16-bit source.
3.24 Frame Pointer Register (FP, Eh[Bh])
Initialization: This register is cleared to 0000h on all forms of reset.
Access: Unrestricted direct read-only access.
BIT DESCRIPTION
15:0 This register provides the current value of the frame pointer (BP[Offs]).
3.25 Data Pointer 0 Register (DP[0], Fh[3h])
Initialization: This register is cleared to 0000h on all forms of reset.
Access: Unrestricted direct read/write access.
BIT DESCRIPTION
15:0
This register is used as a pointer to access data memory. DP[0] can be automatically incremented or decremented
following each read operation or can be automatically incremented or decremented before each write operation.
3.26 Data Pointer 1 Register (DP[1], Fh[7h])
Initialization: This register is cleared to 0000h on all forms of reset.
Access: Unrestricted direct read/write access.
BIT DESCRIPTION
15:0
This register is used as a pointer to access data memory. DP[1] can be automatically incremented or decremented
following each read operation or can be automatically incremented or decremented before each write operation.