Maxim Integrated DS4830 Optical Microcontroller - Manual (Page 220)

DS4830 User’s Guide
220
SECTION 25
– UTILITY ROM
25.1 – Overview
The DS4830 utility ROM includes routines that provide the following functions to application software:

In-application programming routines for flash memory (program, erase, mass erase)

Single word/byte copy and buffer copy routines for lookup tables in flash
To provide backwards compatibility among different versions of the utility ROM, a function address table is included
that contains the entry points for all user-callable functions. With this table, user code can determine the entry point
for a given function as follows:
1. Read the location of the function address table from address 0800Dh in the utility ROM.
2. The entry points for each function listed below are contained in the function address table, one word per function,
in the order given by their function numbers.
For example, the entry point for the UROM_flashEraseAll function can be determined by the following procedure.
1. functionTable = romMemory[800Dh]
2. flashEraseAllEntry = romMemory[functionTable + 2]
It is also possible to call utility ROM functions directly, using the entry points given in Table 25-1. Calling a function
directly will provide faster code execution.
Table 25-1 DS4830 Utility ROM Functions
INDEX FUNCTION NAME ENTRY
POINT
SUMMARY
0 UROM_flashWrite 8438h Programs a single word of flash memory.
1 UROM_flashErasePage 845Bh Erases (programs to FFFFh) a 256-word page of flash.
2 UROM_flashEraseAll 8471h Erases (programs to FFFFh) all flash memory.
3 UROM_moveDP0 8480h Reads a byte/word at DP[0].
4 UROM_moveDP0inc 8483h Reads a byte/word at DP[0], then increments DP[0].
5 UROM_moveDP0dec 8486h Reads a byte/word at DP[0], then decrements DP[0].
6 UROM_moveDP1 8489h Reads a byte/word at DP[1].
7 UROM_moveDP1inc 848Ch Reads a byte/word at DP[1], then increments DP[0].
8 UROM_moveDP1dec 848Fh Reads a byte/word at DP[1], then decrements DP[0].
9 UROM_moveBP 8492h Reads a byte/word at BP[OFFS].
10 UROM_moveBPinc 8495h Reads a byte/word at BP[OFFS], then increments OFFS.
11 UROM_moveBPdec 8498h Reads a byte/word at BP[OFFS], then decrements OFFS.
12 UROM_copyBuffer 849Bh Copies LC[0] bytes/words (up to 255) from DP[0] to BP[OFFS].