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7 – urom_movebp, 8 – urom_movebpinc, 9 – urom_movebpdec – Maxim Integrated DS4830 Optical Microcontroller User Manual

Page 225: Urom_movebp, Urom_movebpinc, Urom_movebpdec, Ds4830 user’s guide

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DS4830 User’s Guide

225

25.3.7

– UROM_moveBP

Function

UROM_moveBP

Summary

Reads the byte/word value pointed to by BP[OFFS].

Inputs

BP[OFFS]: Address to read from data space (include 8000h offset if reading from flash).

Outputs

GR: Data byte/word read.

Destroys

None.

Notes:

Before calling this function, DPC should be set appropriately to configure BP[OFFS] for byte or word mode.

The address passed to this function should be based on the data memory mapping for the utility ROM, as shown
in Figure 25-1. When a byte mode address is used, CDA0 must be set appropriately to access either the upper or
lower half of program flash memory.

This function automatically selects BP[OFFS] as the data pointer before reading the byte/word value.

Implemented as: move GR, @

BP[OFFS]

25.3.8

– UROM_moveBPinc

Function

UROM_moveBPinc

Summary

Reads the byte/word value pointed to by BP[OFFS], then increments OFFS.

Inputs

BP[OFFS]: Address to read from data space (include 8000h offset if reading from flash).

Outputs

GR: Data byte/word read. OFFS is incremented.

Destroys

None

Notes:

Before calling this function, DPC should be set appropriately to configure BP[OFFS] for byte or word mode.

The address passed to this function should be based on the data memory mapping for the utility ROM, as shown
in Figure 25-1. When a byte mode address is used, CDA0 must be set appropriately to access either the upper or
lower half of program flash memory.

This function automatically selects BP[OFFS] as the data pointer before reading the byte/word value.

Implemented as: move GR, @

BP[OFFS++]

25.3.9

– UROM_moveBPdec

Function

UROM_moveBPdec

Summary

Reads the byte/word value pointed to by BP[OFFS], then decrements OFFS.

Inputs

BP[OFFS]: Address to read from data space (include 8000h offset if reading from flash).

Outputs

GR: Data byte/word read. OFFS is decremented.

Destroys

None

Notes:

Before calling this function, DPC should be set appropriately to configure BP[OFFS] for byte or word mode.

The address passed to this function should be based on the data memory mapping for the utility ROM, as shown
in Figure 25-1. When a byte mode address is used, CDA0 must be set appropriately to access either the upper or
lower half of program flash memory.

This function automatically selects BP[OFFS] as the data pointer before reading the byte/word value.

Implemented as: move GR, @

BP[OFFS--]