Maxim Integrated 21-2
MAX31782 User’s Guide
Revision 0; 8/11
SECTION 21: UTILITY ROM
21.1 Overview
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.
Table 21-1. MAX31782 Utility ROM Functions
INDEX FUNCTION NAME
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.
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