參數(shù)資料
          型號(hào): PSD4235G2-70JI
          廠商: 意法半導(dǎo)體
          英文描述: CAP 3.3UF 6.3V 10% TANT SMD-3216-18 TR-13-PL SN100%
          中文描述: Flash在系統(tǒng)可編程外設(shè)的16位微控制器
          文件頁數(shù): 30/93頁
          文件大小: 503K
          代理商: PSD4235G2-70JI
          Preliminary Information
          PSD4000 Series
          27
          The
          PSD4000
          Functional
          Blocks
          (cont.)
          Level 1
          SRAM, I/O
          Level 2
          Secondary Flash Memory
          Highest Priority
          Lowest Priority
          Level 3
          Main Flash Memory
          Figure 5. Priority Level of Memory and I/OComponents
          9.1.3.1. Memory Select Configuration for MCUs with Separate Program and Data Spaces
          The 80C51XA and compatible family of microcontrollers, can be configured to have
          separate address spaces for code memory (selected using PSEN) and data memory
          (selected using RD). Any of the memories within the PSD4000 can reside in either space
          or both spaces. This is controlled through manipulation of the VM register that resides in
          the PSD
          s CSIOP space.
          The VM register is set using PSDsoft to have an initial value. It can subsequently be
          changed by the microcontroller so that memory mapping can be changed on-the-fly.
          For example, you may wish to have SRAM and main Flash in Data Space at boot, and
          secondary Flash memory in Program Space at boot, and later swap main and secondary
          Flash memory. This is easily done with the VM register by using PSDsoft to configure it for
          boot up and having the microcontroller change it when desired.
          Table 11 describes the VM Register.
          Bit 7
          PIO_EN
          Bit 6* Bit 5*
          Bit 4
          FL_Data Boot_Data
          Bit 3
          Bit 2
          FL_Code
          Bit 1
          Bit 0
          Boot_Code SRAM_Code
          0 = disable
          PIO mode
          *
          *
          0 = RD
          can
          t
          access
          Flash
          0 = RD
          can
          t
          access
          Boot Flash
          0 = PSEN
          can
          t
          access
          Flash
          0 = PSEN
          can
          t
          access
          Boot Flash
          0 = PSEN
          can
          t
          access
          SRAM
          1= enable
          PIO mode
          *
          *
          1 = RD
          access
          Flash
          1 = RD
          access
          Boot Flash
          1 = PSEN
          access
          Flash
          1 = PSEN
          access
          Boot Flash
          1 = PSEN
          access
          SRAM
          Table 11. VM Register
          NOTE:
          Bits 6-5 are not used.
          相關(guān)PDF資料
          PDF描述
          PSD4235G2-70M CAP 3.3UF 6.3V 10% TANT SMD-3216-18 TR-13-PL SN100% ROHS-GUARANTEED
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