MAXQ Family User’s Guide:
MAXQ8913 Supplement
25-1
SECTION 25: UTILITY ROM (SPECIFIC TO MAXQ8913)
25.1 Overview
The MAXQ8913 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
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 + 2]
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; also see Appendix 1. This method calls functions more
quickly, but the application may need to be recompiled in order to run properly with a different version of the utility
ROM.
Table 25-1. Functions for MAXQ8913 Utility ROM
INDEX FUNCTION NAME ENTRY POINT SUMMARY
0 UROM_flashWrite 8788h Programs a single word of flash memory.
1 UROM_flashErasePage 87ABh Erases (programs to FFFFh) a 512-word sector of flash memory.
2 UROM_flashEraseAll 87C1h Erases (programs to FFFFh) all flash memory.
3 UROM_moveDP0 87D0h Reads a byte/word at DP[0].
4 UROM_moveDP0inc 87D3h Reads a byte/word at DP[0], then increments DP[0].
5 UROM_moveDP0dec 87D6h Reads a byte/word at DP[0], then decrements DP[0].
6 UROM_moveDP1 87D9h Reads a byte/word at DP[1].
7 UROM_moveDP1inc 87DCh Reads a byte/word at DP[1], then increments DP[0].
8 UROM_moveDP1dec 87DFh Reads a byte/word at DP[1], then decrements DP[0].
9 UROM_moveBP 87E2h Reads a byte/word at BP[OFFS].
10 UROM_moveBPinc 87E5h Reads a byte/word at BP[OFFS], then increments OFFS.
11 UROM_moveBPdec 87E8h Reads a byte/word at BP[OFFS], then decrements OFFS.
12 UROM_copyBuffer 87EBh Copies LC[0] values (up to 256) from DP[0] to BP[OFFS].
Maxim Integrated
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