MAXQ3120-FFN データシートの表示（PDF） - Dallas Semiconductor -> Maxim Integrated

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MAXQ3120-FFN

High-Precision ADC Mixed-Signal Microcontroller

Dallas Semiconductor -> Maxim Integrated 

High-Precision ADC

Mixed-Signal Microcontroller

Refer to the user’s guide supplement for this device for

more details.

In all cases, whichever memory segment is currently

being executed from cannot be accessed in data space.

To allow the use of lookup tables and similar constructs

in the flash memory, the utility ROM contains a set of

lookup and block copy routines (refer to the user’s guide

supplement for this device for more details).

The incorporation of flash memory allows the device to

be reprogrammed, eliminating the expense of throwing

away one-time programmable devices during develop-

ment and field upgrades. Flash memory can be pass-

word protected with a 16-word key, denying access to

program memory by unauthorized individuals.

Stack Memory

A 16-bit-wide internal stack provides storage for pro-

gram return addresses and general-purpose use. The

stack is used automatically by the processor when the

CALL, RET, and RETI instructions are executed and

interrupts serviced. The stack can also be used explic-

itly to store and retrieve data by using the PUSH, POP,

and POPI instructions.

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

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

and POPI operations retrieve the value at the stack

location pointed to by SP, and then decrement SP.

Utility ROM

The utility ROM is a 2kWord 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:

• In-system programming (bootloader) over the JTAG

interface

• In-circuit debug routines

• Test routines (internal memory tests, memory loader,

etc.)

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

gramming and code space table lookup

SYSTEM

REGISTERS

x0h

xFh

8xh

AP

9xh

A

Bxh

PFX

Cxh

IP

Dxh

SP

Exh

DPC

Fxh

DP

PROGRAM

SPACE

256 x 16

DATA SRAM

A0FFh

A000h

DATA SPACE

(BYTE MODE)

DATA SPACE

(WORD MODE)

PERIPHERAL

REGISTERS

x0h

0xh

1xh

2xh

3xh

x1Fh

M0

M1

M2

M3

16 x 16

STACK

Figure 1. Memory Map

2k x 16

UTILITY ROM

87FFh

8000h

3FFFh

16k x 16

PROGRAM

FLASH

OR MASKED

ROM

0000h

4k x 8

UTILITY ROM

8FFFh

8000h

2k x 16

UTILITY ROM

87FFh

8000h

512 x 8

DATA SRAM

01FFh

0000h

256 x 16

DATA SRAM

00FFh

0000h

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