DS2252T Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2252T

Secure Microcontroller Module

Dallas Semiconductor -> Maxim Integrated 

DS2252T

DS2252T MEMORY MAP WITH (PES=1) Figure 4

FFFFh

PROGRAM MEMORY

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ C000h

ÎÎÎÎÎÎ PARTITION

ÏÏÎÏÏÎÏÏÎÏÏÎÏÏÎÏÏÎ 8000h

ÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏ 4000h

NVRAM

PROGRAM

ÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏ 0000h

ÎÎÎÎ NOT ACCESSIBLE

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎDATA ÎÎÎÎÎÎÎÎÎMEMOÎÎÎÎÎÎÎÎÎRY (ÎÎÎÎÎÎÎÎÎMOVXÎÎÎÎÎÎÎÎÎ)

64K

16K

REAL–TIME

CLOCK

POWER MANAGEMENT

The DS2252T monitors VCC to provide Power–fail

Reset, early warning Power–fail Interrupt, and switch

over to lithium backup. It uses an internal band–gap ref-

erence in determining the switch points. These are

called VPFW, VCCMIN, and VLI respectively. When VCC

drops below VPFW, the DS2252T will perform an inter-

rupt vector to location 2Bh if the power fail warning was

enabled. Full processor operation continues regard-

less. 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 inac-

tive (logic 1) state. VCC is still the power source at this

time. When VCC drops further to below VLI, internal cir-

cuitry 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

User’s Guide has more information on this topic. The trip

points VCCMIN and VPFW are listed in the electrical spec-

ifications.

121395 7/14

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