DS2252T View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

DS2252T

Soft Microcontroller Module

Maxim Integrated 

DS2252T MEMORY MAP WITH (PES = 1) Figure 4

PROGRAM MEMORY

FFFFh --

DATA MEMORY (MOVX)

-- 64K

DS2252T

C000h --

PARTITION

B000h --

4000h --

NV RAM

PROGRAM

0000h --

REAL-TIME

CLOCK

-- 16K

= NOT ACCESSIBLE

POWER MANAGEMENT

The DS2252T monitors VCC to provide power-fail reset, early warning power-fail interrupt, and

switchover to lithium backup. It uses an internal band-gap reference in determining the switch points.

These are called VPFW, VCCMIN, and VLI respectively. When VCC drops below VPFW, the DS2252T will

perform an interrupt vector to location 2Bh if the power-fail warning is enabled. Full processor operation

continues regardless. When power falls further to VCCMIN, the DS2252T invokes a reset state. No further

code execution will be performed unless power rises back above VCCMIN. All decoded chip enables and

the R/ W signal go to an inactive (logic 1) state. VCC is still the power source at this time. When VCC

drops further to below VLI, internal circuitry will switch to the built-in lithium cell for power. The

majority of internal circuits will be disabled and the remaining nonvolatile states will be retained. The

Secure Microcontroller User’s Guide has more information on this topic. The trip points VCCMIN and

VPFW are listed in the electrical specifications.

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