Rainbow-electronics MAXQ2010 Manual de usuario descargar pdf (Pagina 22)

MAXQ2010

16-Bit Mixed-Signal Microcontroller with LCD

22 ______________________________________________________________________________________

On reset, the stack pointer, SP, initializes to the top of

the stack (0Fh). The CALL, PUSH, and interrupt-vector-

ing operations increment SP, then store a value at the

location pointed to by SP. The RET, RETI, POP, and

POPI operations retrieve the value at SP and then

decrement SP.

Utility ROM

The utility ROM is a 4KB block of internal ROM memory

that defaults to a starting address of 8000h. The utility

ROM consists of subroutines that can be called from

application software. These include the following:

• In-system programming (bootstrap loader) using

JTAG interface

• In-circuit debug routines

• Test routines (internal memory tests, memory loader,

etc.)

• User-callable routines for in-application flash pro-

gramming and fast table lookup

Following any reset, execution begins in the utility ROM.

The ROM software determines whether the program

execution should immediately jump to location 0000h,

the start of user-application code, or to one of the spe-

cial routines mentioned. Routines within the utility ROM

are user-accessible and can be called as subroutines

by the application software. More information on the

utility ROM contents is contained in the

MAXQ Family

User’s Guide: MAXQ2010 Supplement

Some applications require protection against unautho-

rized viewing of program code memory. For these

PROGRAM

SPACE

DATA

SPACE

2K x 16

UTILITY ROM

1K x 16

DATA RAM

32K x 16

PROGRAM

MEMORY

8000h

00h

0Fh

FFFFh

WBSn = 1

FFFFh

WBSn = 0

FFFFh

07FFh03FFh

0000h 0000h

87FFh

7FFFh

0000h

0Fh

07h

06h

00h

1Fh

SPRs

SFRs

REGISTERS

FFh

16 x 16

STACK

Figure 5. MAXQ2010 Default Memory Map

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 32 33

MAXQ2010 1

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