Maxim Integrated MAXQ610 - Manual (Page 195)

15-2
MAXQ610 User’s Guide
SECTION 15: UTILITY ROM
The MAXQ610 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 use with lookup tables
• Entry into stop mode
• Ability to check a value against a stored secret
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 = dataMemory[0800Dh]
2) flashWriteEntry = dataMemory[functionTable + 0]
It is also possible to call utility ROM functions directly, using the entry points given above . Standard include files are
provided for this purpose with the MAXQ development toolset . This method calls functions more quickly, but the appli-
cation might need to be recompiled in order to run properly with a different version of the utility ROM .
Table 15-1. Functions for MAXQ610 Utility ROM Version 1.00
INDEX FUNCTION NAME
ENTRY
POINT
SUMMARY
0 UROM_flashWrite 8544h Programs a single word of flash memory .
1 UROM_flashErasePage 8566h Erases (programs to FFFFh) a 512-word sector of flash memory .
2 UROM_flashEraseAll 857Bh Erases (programs to FFFFh) all flash memory .
3 UROM_moveDP0 8589h Reads a byte/word at DP[0] .
4 UROM_moveDP0inc 858Ch Reads a byte/word at DP[0], then increments DP[0] .
5 UROM_moveDP0dec 858Fh Reads a byte/word at DP[0], then decrements DP[0] .
6 UROM_moveDP1 8592h Reads a byte/word at DP[1] .
7 UROM_moveDP1inc 8595h Reads a byte/word at DP[1], then increments DP[0] .
8 UROM_moveDP1dec 8598h Reads a byte/word at DP[1], then decrements DP[0] .
9 UROM_moveFP 859Bh Reads a byte/word at BP[OFFS] .
10 UROM_moveFPinc 859Eh Reads a byte/word at BP[OFFS], then increments OFFS .
11 UROM_moveFPdec 85A1h Reads a byte/word at BP[OFFS], then decrements OFFS .
12 UROM_copyBuffer 85A4h Copies LC[0] values (up to 255) from DP[0] to BP[OFFS] .
13 UROM_stopMode 85AAh Enters stop mode .