Maxim Integrated MAXQ7666 User Manual
Page 379
MAXQ7665/MAXQ7666 User’s Guide
16-2
SECTION 16: UTILITY ROM (SPECIFIC TO MAXQ7666 WITH TYPE F
FLASH)
The MAXQ7666 utility ROM includes routines that provide the following functions to application software:
• In-application programming routines for Type F 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 MAXQ7666 flash type is identified by bit 4 of the read-only OTP register (Module 5, Index 0Dh). For devices with Type F flash, OTP
register bit 4 (OTP.4) = 0. Only the MAXQ7666 supports Type F flash.
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 16-1 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 programFlashEraseAll 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 16-1. Standard include files are provided
for this purpose with the MAXQ7666 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 16-1. Utility ROM User Functions (for Utility ROM Version 1.01)
FUNCTION NUMBER
FUNCTION NAME
ENTRY POINT
SUMMARY
0
programFlashWritePage
0882Ah
Writes an entire 32-word/64-byte program flash page.
1
programFlashErasePage
0883Fh
Erases (programs to FFFFh) two pages of program flash.
2 programFlashEraseAll
08866h
Erases (programs to FFFFh) the entire program flash
memory.
3
moveDP0
08874h
Reads a byte/word at DP[0]
4
moveDP0inc
08877h
Reads a byte/word at DP[0], then increments DP[0].
5
moveDP0dec
0887Ah
Reads a byte/word at DP[0], then decrements DP[0].
6
moveDP1
0887Dh
Reads a byte/word at DP[1].
7
moveDP1inc
08880h
Reads a byte/word at DP[1], then increments DP[1].
8
moveDP1dec
08883h
Reads a byte/word at DP[1], then decrements DP[1].
9
moveFP
08886h
Reads a byte/word at BP[OFFS].
10
moveFPinc
08889h
Reads a byte/word at BP[OFFS], then increments OFFS.
11
moveFPdec
0888Ch
Reads a byte/word at BP[OFFS], then decrements OFFS.
12
copyBuffer
0888Fh
Copies LC[0] values from DP[0] to BP[OFFS].
13 tempConv
08895h
Performs
temperature
conversion.
14 — —
Reserved.
15 — —
Reserved.
Maxim Integrated