参数资料
型号: PSD4235F1-C-90UI
厂商: 意法半导体
英文描述: Flash In-System-Programmable Peripherals for 16-Bit MCUs
中文描述: Flash在系统可编程外设的16位微控制器
文件页数: 30/93页
文件大小: 503K
代理商: PSD4235F1-C-90UI
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.
相关PDF资料
PDF描述
PSD4235F2-15UI Flash In-System-Programmable Peripherals for 16-Bit MCUs
PSD4235F2-70UI Flash In-System-Programmable Peripherals for 16-Bit MCUs
PSD4235F2-90B81 Flash In-System-Programmable Peripherals for 16-Bit MCUs
PSD4235F2-90B81I Flash In-System-Programmable Peripherals for 16-Bit MCUs
PSD4235F2-90J Flash In-System-Programmable Peripherals for 16-Bit MCUs
相关代理商/技术参数
参数描述
PSD4235G2-70U 功能描述:SPLD - 简单可编程逻辑器件 5.0V 4M 70ns 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
PSD4235G2-90U 功能描述:CPLD - 复杂可编程逻辑器件 5.0V 4M 90ns RoHS:否 制造商:Lattice 系列: 存储类型:EEPROM 大电池数量:128 最大工作频率:333 MHz 延迟时间:2.7 ns 可编程输入/输出端数量:64 工作电源电压:3.3 V 最大工作温度:+ 90 C 最小工作温度:0 C 封装 / 箱体:TQFP-100
PSD4235G2-90UI 功能描述:CPLD - 复杂可编程逻辑器件 5.0V 4M 90ns RoHS:否 制造商:Lattice 系列: 存储类型:EEPROM 大电池数量:128 最大工作频率:333 MHz 延迟时间:2.7 ns 可编程输入/输出端数量:64 工作电源电压:3.3 V 最大工作温度:+ 90 C 最小工作温度:0 C 封装 / 箱体:TQFP-100
PSD4235G2V-12UI 功能描述:CPLD - 复杂可编程逻辑器件 3.3V 4M 120ns RoHS:否 制造商:Lattice 系列: 存储类型:EEPROM 大电池数量:128 最大工作频率:333 MHz 延迟时间:2.7 ns 可编程输入/输出端数量:64 工作电源电压:3.3 V 最大工作温度:+ 90 C 最小工作温度:0 C 封装 / 箱体:TQFP-100
PSD4235G2V-90U 功能描述:CPLD - 复杂可编程逻辑器件 3.3V 4M 90ns RoHS:否 制造商:Lattice 系列: 存储类型:EEPROM 大电池数量:128 最大工作频率:333 MHz 延迟时间:2.7 ns 可编程输入/输出端数量:64 工作电源电压:3.3 V 最大工作温度:+ 90 C 最小工作温度:0 C 封装 / 箱体:TQFP-100