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MAXQ7665/MAXQ7666 User’s Guide

15-2

SECTION 15: UTILITY ROM (SPECIFIC TO MAXQ7665A–MAXQ7665D

WITH TYPE A FLASH)

The MAXQ7665 utility ROM includes routines that provide the following functions to application software:

• In-application programming routines for Type A flash memory (program, erase, mass erase)

• Single word/byte copy and buffer copy routines for use with lookup tables

• Temperature conversion routine to perform internal/remote diode-connected transistor based temperature measurement

The MAXQ7665 flash type is identified by bit 4 of the read-only OTP register (Module 5, Index 0Dh). For devices with Type A flash, OTP

To provide backward 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 in Table 15-1 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 flashEraseAll function can be accessed and called by the following procedure.

get_urom_table_entry:

move dpc, #1Ch //all data pointers in word mode

move dp[0], #0800Dh //initialize dp[0]

move bp, @dp[0] //load function address table location in bp

move offs, #2 //load function number in offs

call @bp[offs] //call flashEraseAll

It is also possible to call utility ROM functions directly, using the entry points given in Table 15-1. Standard include files are provided

for this purpose with the MAXQ7665 development tool set. 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 15-1. Utility ROM User Functions (for Utility ROM Version 1.01)

FUNCTION NUMBER FUNCTION NAME ENTRY POINT SUMMARY

0 — — Reserved.

1 flashEraseSector 08836h Erases (programs to FFFFh) a sector of flash memory.

2 flashEraseAll 0885Dh Erases (programs to FFFFh) all flash memory.

3 moveDP0 0886Bh Reads a byte/word at DP[0].

4 moveDP0inc 0886Eh Reads a byte/word at DP[0], then increments DP[0].

5 moveDP0dec 08871h Reads a byte/word at DP[0], then decrements DP[0].

6 moveDP1 08874h Reads a byte/word at DP[1].

7 moveDP1inc 08877h Reads a byte/word at DP[1], then increments DP[1].

8 moveDP1dec 0887Ah Reads a byte/word at DP[1], then decrements DP[1].

9 moveFP 0887Dh Reads a byte/word at BP[OFFS].

10 moveFPinc 08880h Reads a byte/word at BP[OFFS], then increments OFFS.

11 moveFPdec 08883h Reads a byte/word at BP[OFFS], then decrements OFFS.

12 copyBuffer 08886h Copies LC[0] values from DP[0] to BP[OFFS].

13 tempConv 0888Ch Performs temperature conversion.

14 flashWriteA 088DBh Writes a word to the flash memory.

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