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参数资料
型号： PSD935F1-B-90B81
厂商： 意法半导体
英文描述： Configurable Memory System on a Chip for 8-Bit Microcontrollers
中文描述： 在8片位微控制器可配置存储系统
文件页数： 22/91页
文件大小： 488K
代理商： PSD935F1-B-90B81
PSD9XX Family
PSD935G2
28
The
PSD935G2
Functional
Blocks
(cont.)
Level 1
SRAM, I /O
Level 2
Secondary Flash Memory
Highest Priority
Lowest Priority
Level 3
Main Flash Memory
Figure 6. Priority Level of Memory and I/O Components
9.1.3.1. Memory Select Configuration for MCUs with Separate Program and Data Spaces
The 80C51 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 PSD935G2 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
Bit 6* Bit 5*
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIO_EN
FL_Data Boot_Data
FL_Code
Boot_Code SRAM_Code
0 = disable
**
0 = RD
0 = PSEN
PIO mode
can’t
access
Flash
Boot Flash
Flash
Boot Flash
SRAM
1= enable
**
1 = RD
1 = PSEN
PIO mode
access
Flash
Boot Flash
Flash
Boot Flash
SRAM
Table 11. VM Register
NOTE: Bits 6-5 are not used.
相关PDF资料
PDF描述
PSD935F1-B-90B81I Ceramic Chip Capacitors / MIL-PRF-55681; Capacitance [nom]: 20pF; Working Voltage (Vdc)[max]: 100V; Capacitance Tolerance: +/-10%; Dielectric: Multilayer Ceramic; Temperature Coefficient: C0G (NP0); Lead Style: Surface Mount Chip; Lead Dimensions: 0805; Termination: 100% Tin (Sn); Body Dimensions: 0.080" x 0.050" x 0.055"; Container: Bag; Features: MIL-PRF-55681: S Failure Rate
PSD935F1-B-90J Configurable Memory System on a Chip for 8-Bit Microcontrollers
PSD935F1-B-90JI Configurable Memory System on a Chip for 8-Bit Microcontrollers
PSD935F1-B-90M Configurable Memory System on a Chip for 8-Bit Microcontrollers
PSD935F1-B-90MI Configurable Memory System on a Chip for 8-Bit Microcontrollers
相关代理商/技术参数
参数描述
PSD935G2-90U 功能描述:SPLD - 简单可编程逻辑器件 TQFP-80 5V 4M 90N RoHS:否 制造商:Texas Instruments 逻辑系列:TICPAL22V10Z 大电池数量:10 最大工作频率:66 MHz 延迟时间:25 ns 工作电源电压:4.75 V to 5.25 V 电源电流:100 uA 最大工作温度:+ 75 C 最小工作温度:0 C 安装风格:Through Hole 封装 / 箱体:DIP-24
PSD935G2V-90U 功能描述:SPLD - 简单可编程逻辑器件 U 511-PSD835G2V-90U RoHS:否 制造商:Texas Instruments 逻辑系列:TICPAL22V10Z 大电池数量:10 最大工作频率:66 MHz 延迟时间:25 ns 工作电源电压:4.75 V to 5.25 V 电源电流:100 uA 最大工作温度:+ 75 C 最小工作温度:0 C 安装风格:Through Hole 封装 / 箱体:DIP-24
PSD954F2-90J 功能描述:SPLD - 简单可编程逻辑器件 U 511-PSD854F2-90J RoHS:否 制造商:Texas Instruments 逻辑系列:TICPAL22V10Z 大电池数量:10 最大工作频率:66 MHz 延迟时间:25 ns 工作电源电压:4.75 V to 5.25 V 电源电流:100 uA 最大工作温度:+ 75 C 最小工作温度:0 C 安装风格:Through Hole 封装 / 箱体:DIP-24
PSD954F2-90M 功能描述:SPLD - 简单可编程逻辑器件 U 511-PSD854F2-90M RoHS:否 制造商:Texas Instruments 逻辑系列:TICPAL22V10Z 大电池数量:10 最大工作频率:66 MHz 延迟时间:25 ns 工作电源电压:4.75 V to 5.25 V 电源电流:100 uA 最大工作温度:+ 75 C 最小工作温度:0 C 安装风格:Through Hole 封装 / 箱体:DIP-24
PSD954F2V-90J 功能描述:SPLD - 简单可编程逻辑器件 5.0V 2M 90ns RoHS:否 制造商:Texas Instruments 逻辑系列:TICPAL22V10Z 大电池数量:10 最大工作频率:66 MHz 延迟时间:25 ns 工作电源电压:4.75 V to 5.25 V 电源电流:100 uA 最大工作温度:+ 75 C 最小工作温度:0 C 安装风格:Through Hole 封装 / 箱体:DIP-24
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