Rainbow-electronics MAXQ7670 Manual de usuario descargar pdf (Pagina 27)

MAXQ7670

Microcontroller with 10-Bit ADC,

PGA, 64KB Flash, and CAN Interface

______________________________________________________________________________________ 27

application code to store data when context switching

(e.g., during a call or an interrupt). Storing and retriev-

ing 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.

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.

EXECUTING

FROM

PROGRAM

SPACE

DATA SPACE

(WORD MODE)

1024 x 16

DATA RAM

4K x 16

UTILITY ROM

32K x 16

PROGRAM

FLASH

FFFFh

A3FFh

7FFFh

0000h

A400h

A000h

8FFFh

8000h

8FFFh

8000h

03FFh

0000h

FFFFh

7FFFh

0400h

9000h

DATA SPACE

(BYTE MODE)

8K x 8

UTILITY ROM

2048 x 8

DATA RAM

FFFFh

7FFFh

0400h

03FFh

0000h

9000h

8FFFh

8000h

1024 x 16

DATA RAM

4K x 16

UTILITY ROM

Figure 12. MAXQ7670 Memory Map

32K x 16

PROGRAM

FLASH

7FFFh

0000h

1 PAGE = 256 WORDS

PAGE 127

PAGE 126

PAGE 125

PAGE 2

PAGE 1

PAGE 0

Figure 13. Flash Memory Sector Maps

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 36 37

MAXQ7670 1

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