Maxim Integrated MAX31782 - Manual (Page 215)

MaximIntegrated 21-2
MAX31782 User’s Guide
Revision 0; 8/11
SECTION 21: UTILITY ROM
21.1Overview
The MAX31782 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
• Entry into stop mode
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 21-1 . Calling a function
directly will provide faster code execution .
Table21-1.MAX31782UtilityROMFunctions
INDEX FUNCTIONNAME
ENTRY
POINT
SUMMARY
0 UROM_flashWrite 8449h Programs a single word of flash memory .
1 UROM_flashErasePage 846Ch Erases (programs to FFFFh) a 512-byte (256-word) sector of flash memory .
2 UROM_flashEraseAll 8482h Erases (programs to FFFFh) all flash memory .
3 UROM_moveDP0 8491h Reads a byte/word at DP[0] .
4 UROM_moveDP0inc 8494h Reads a byte/word at DP[0], then increments DP[0] .
5 UROM_moveDP0dec 8497h Reads a byte/word at DP[0], then decrements DP[0] .
6 UROM_moveDP1 849Ah Reads a byte/word at DP[1] .
7 UROM_moveDP1inc 849Dh Reads a byte/word at DP[1], then increments DP[0] .
8 UROM_moveDP1dec 84A0h Reads a byte/word at DP[1], then decrements DP[0] .
9 UROM_moveBP 84A3h Reads a byte/word at BP[OFFS] .
10 UROM_moveBPinc 84A6h Reads a byte/word at BP[OFFS], then increments OFFS .
11 UROM_moveBPdec 84A9h Reads a byte/word at BP[OFFS], then decrements OFFS .
12 UROM_copyBuffer 84ACh Copies LC[0] bytes/words (up to 255) from DP[0] to BP[OFFS] .
13 UROM_stopMode 84B2h Enters stop mode .