參數(shù)資料
型號(hào): DS2252T-128-16
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: Microcontroller
英文描述: 8-BIT, 16 MHz, MICROCONTROLLER, SMA40
封裝: SIMM-40
文件頁數(shù): 14/16頁
文件大?。?/td> 674K
代理商: DS2252T-128-16
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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