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DS2252T Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS2252T Datasheet(HTML) 7 Page - Dallas Semiconductor |
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7 / 16 page  DS2252T 7 of 16 DS2252T MEMORY MAP WITH (PES = 1) Figure 4 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. NV RAM PROGRAM PROGRAM MEMORY DATA MEMORY (MOVX) FFFFh -- 0000h -- PARTITION = NOT ACCESSIBLE REAL-TIME CLOCK C000h -- B000h -- 4000h -- -- 64K -- 16K |
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