maxq7670aatl+ Maxim Integrated Products, Inc., maxq7670aatl+ Datasheet - Page 27

• Manufacturer Part Number: maxq7670aatl+
• Description: Microcontroller With 12-bit Adc, Pga, 64kb Flash, And Can Interface
• Manufacturer: Maxim Integrated Products, Inc.

the application code to store data when context switch-
ing (e.g., during a call or an interrupt). Storing and
retrieving data is executed through the PUSH, POP,
and POPI instructions.
The incorporation of flash memory allows device repro-
gramming, eliminating the expense of discarding one-
time programmable devices during development and
field upgrades (see Figure 13 for the flash memory sec-
tor maps).
A 16-word key protects the flash memory from access
by unauthorized individuals. Without supplying the 16-
word key, the password lock (PWL) bit in the SC regis-
ter remains set, and the utility ROM is inaccessible.
Supplying the 16-word key makes the utility ROM trans-
parent. The password-unlock command is issued
through the TAP interface. The 16-word password is
compared to the password in the program space to
determine its validity.
Figure 12. MAXQ7670A Memory Map
EXECUTING
FROM
______________________________________________________________________________________
PROGRAM
UTILITY ROM
DATA RAM
PROGRAM
1024 x 16
32K x 16
SPACE
4K x 16
FLASH
PGA, 64KB Flash, and CAN Interface
FFFFh
A400h
A3FFh
A000h
8FFFh
8000h
7FFFh
0000h
Microcontroller with 12-Bit ADC,
(WORD MODE)
DATA SPACE
UTILITY ROM
DATA RAM
1024 x 16
4K x 16
Enabling a pseudo-Von Neumann memory map places
the utility ROM, code, and data memory into a single
contiguous memory map. Use this mapping scheme for
applications that require dynamic program modification
or unique memory configurations.
Figure 13. Flash Memory Sector Maps
7FFFh
0000h
PROGRAM
32K x 16
FLASH
8FFFh
8000h
03FFh
0000h
FFFFh
9000h
7FFFh
0400h
PAGE 127
PAGE 126
PAGE 125
PAGE 2
PAGE 1
PAGE 0
(BYTE MODE)
DATA SPACE
UTILITY ROM
DATA RAM
2048 x 8
8K x 8
1 PAGE = 256 WORDS
FFFFh
9000h
8FFFh
8000h
7FFFh
0400h
03FFh
0000h
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