Maxim-integrated DS4830 Optical Microcontroller Bedienungsanleitung PDF herunterladen (Seite 30)

DS4830 User’s Guide

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.

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Maxim-integrated DS4830 Optical Microcontroller Bedienungsanleitung Seite 30