參數(shù)資料
型號(hào)： PSD913F2V
英文描述： 200V 100kRad Hi-Rel Single N-Channel TID Hardened MOSFET in a SMD-2 package; A IRHNA7260 with Standard Packaging
中文描述： 可配置的存儲(chǔ)系統(tǒng)級(jí)芯片的8位微控制器
文件頁(yè)數(shù)： 30/94頁(yè)
文件大?。?/td> 463K
代理商： PSD913F2V
Preliminary
PSD913F1
29
The
PSD913F1
Functional
Blocks
(cont.)
9.1.2 SRAM
The SRAM is a 16 Kbit (2K x 8) memory. The SRAM is enabled when RS0
—
the SRAM
chip select output from the DPLD
—
is high. RS0 can contain up to two product terms,
allowing flexible memory mapping.
The SRAM can be backed up using an external battery. The external battery should be
connected to the Vstby pin (PC2). If you have an external battery connected to the
PSD913F1, the contents of the SRAM will be retained in the event of a power loss. The
contents of the SRAM will be retained so long as the battery voltage remains at 2V or
greater. If the supply voltage falls below the battery voltage, an internal power switchover to
the battery occurs.
Pin PC4 can be configured as an output that indicates when power is being drawn from the
external battery. This Vbaton signal will be high with the supply voltage falls below the
battery voltage and the battery on PC2 is supplying power to the internal SRAM.
The chip select signal (RS0) for the SRAM, Vstby, and Vbaton are all configured using
PSDsoft.
9.1.3 Memory Select Signals
The main Flash (FSi), EEPROM (EESi), and SRAM (RS0) memory select signals are all
outputs of the DPLD. They are setup by entering equations for them in PSDsoft. The
following rules apply to the equations for the internal chip select signals:
1. Flash memory and EEPROM memory sector select signals must
not
be larger than the
physical sector size.
2. Any main Flash memory sector must
not
be mapped in the same memory space as
another Flash sector.
3. An EEPROM memory sector must
not
be mapped in the same memory
space as another EEPROM sector.
4. SRAM, I/O, and Peripheral I/O spaces must
not
overlap.
5. An EEPROM memory sector
may
overlap a main Flash memory sector.
In case of overlap, priority will be given to the EEPROM.
6. SRAM, I/O, and Peripheral I/O spaces
may
overlap any other memory sector. Priority
will be given to the SRAM, I/O, or Peripheral I/O.
Example
FS0 is valid when the address is in the range of 8000h to BFFFh, EES0 is valid from
8000h to 9FFFh, and RS0 is valid from 8000h to 87FFh. Any address in the range of RS0
will always access the SRAM. Any address in the range of EES0 greater than 87FFh (and
less than 9FFFh) will automatically address EEPROM memory segment 0. Any address
greater than 9FFFh will access the Flash memory segment 0. You can see that half of the
Flash memory segment 0 and one-fourth of EEPROM segment 0 can not be accessed in
this example. Also note that an equation that defined FS1 to anywhere in the range of
8000h to BFFFh would
not
be valid.
Figure 7 shows the priority levels for all memory components. Any component on a higher
level can overlap and has priority over any component on a lower level. Components on the
same level must
not
overlap. Level one has the highest priority and level 3 has the lowest.
相關(guān)PDF資料
PDF描述
PSD913F2(中文) Configurable Memory System on a Chip for 8-Bit Microcontrollers(用于8位MCU的可配置存儲(chǔ)器系統(tǒng))
PSD934F2(中文) Configurable Memory System on a Chip for 8-Bit Microcontrollers(用于8位MCU的可配置存儲(chǔ)器系統(tǒng))
PSD913F2 Configurable Memory System on a Chip for 8-Bit Microcontrollers(用于8位MCU的可配置存儲(chǔ)器系統(tǒng))
PSD934F2 Configurable Memory System on a Chip for 8-Bit Microcontrollers(用于8位MCU的可配置存儲(chǔ)器系統(tǒng))
PSD935G2 Configurable Memory System on a Chip for 8-Bit Microcontrollers(8位微控制器片上存儲(chǔ)器可編程外設(shè))
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PSD913F2V-12B81 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash In-System Programmable ISP Peripherals For 8-bit MCUs
PSD913F2V-12B81I 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash In-System Programmable ISP Peripherals For 8-bit MCUs
PSD913F2V-12J 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash In-System Programmable ISP Peripherals For 8-bit MCUs
PSD913F2V-12J1T 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash in-system programmable (ISP) peripherals for 8-bit MCUs, 3.3 V
PSD913F2V-12JI 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash In-System Programmable ISP Peripherals For 8-bit MCUs
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