收藏本站
参数资料
型号： 101-1155
厂商： Rabbit Semiconductor
文件页数： 87/134页
文件大小： 0K
描述： KIT DEVELOPMENT USA RCM4200
标准包装： 1
系列： RabbitCore 4000
类型： MPU 核心模块
适用于相关产品： RCM4200
所含物品： RabbitCore 模块、开发板、交流适配器、缆线和 Dynamic C? 光盘
其它名称： 316-1126
50
RabbitCore RCM4200
5.2.4 SRAM Use
The RCM4200 module has a battery-backed data SRAM and a program-execution
SRAM. Dynamic C provides the protected keyword to identify variables that are to be
placed into the battery-backed SRAM. The compiler generates code that maintains two
copies of each protected variable in the battery-backed SRAM. The compiler also generates
a flag to indicate which copy of the protected variable is valid at the current time. This flag
is also stored in the battery-backed SRAM. When a protected variable is updated, the
“inactive” copy is modified, and is made “active” only when the update is 100% complete.
This assures the integrity of the data in case a reset or a power failure occurs during the
update process. At power-on the application program uses the active copy of the variable
pointed to by its associated flag.
The sample code below shows how a protected variable is defined and how its value can
be restored.
main() {
protected int state1, state2, state3;
...
_sysIsSoftReset();
// restore any protected variables
The bbram keyword may also be used instead if there is a need to store a variable in
battery-backed SRAM without affecting the performance of the application program. Data
integrity is not assured when a reset or power failure occurs during the update process.
Additional information on bbram and protected variables is available in the Dynamic C
User’s Manual.
5.2.4.1 SRAM Chip Select Considerations
The basic SRAM memory on Rabbit-based boards is always connected to /CS1, /OE1, and
/WE1. Both the data SRAM and the program execution fast SRAM on the RCM4200
share /OE1.
The BIOS-defined macro, CS1_ALWAYS_ON, is set to 0 by default to disable /CS1 (set it
high). The macro may be redefined in the BIOS to 1, which will set a bit in the MMIDR
register that forces /CS1 to stay enabled (low). This capability is normally used to speed up
access time for battery-backed SRAM as long as no other memory chips are connected to
/OE1 and /WE1. Therefore, the CS1_ALWAYS_ON macro must remain at its default setting
of 0 to avoid conflicts between the data SRAM and the program execution fast SRAM.
相关PDF资料
PDF描述
M3DGK-6036J IDC CABLE - MKR60K/MC60G/MCS60K
MAX6428OSUR+T IC MONITOR BAT LP SOT23-3
M3DEK-6036J IDC CABLE - MKR60K/MC60G/MCE60K
AFK106M50D16T-F CAP ALUM 10UF 50V 20% SMD
VI-26R-EY-S CONVERTER MOD DC/DC 7.5V 50W
相关代理商/技术参数
参数描述
101-1156 功能描述:开发板和工具包 - 其他处理器 RCM4200 Dev Kit (Intl) RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
101-115-6110-EV 功能描述:编码器 1mA PUSH 220gf 12 PULSE 24 DETENTS RoHS:否 制造商:Avago Technologies 产品:Optical Encoders 类型:Absolute 每转脉冲: 制动器数量: 通道数量:2 安装风格:Through Hole 端接类型:Solder Pin 输出: 轴类型: 带开关: 电源电压:5 V 工作温度范围:- 40 C to + 115 C
101-115-6191-EV 功能描述:编码器 1mA PUSH 220gf 12 PULSE 24 DETENTS RoHS:否 制造商:Avago Technologies 产品:Optical Encoders 类型:Absolute 每转脉冲: 制动器数量: 通道数量:2 安装风格:Through Hole 端接类型:Solder Pin 输出: 轴类型: 带开关: 电源电压:5 V 工作温度范围:- 40 C to + 115 C
101-1157 功能描述:开发板和工具包 - 其他处理器 RCM4100 Analog Dev Kit (US) RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
101-1158 功能描述:开发板和工具包 - 其他处理器 RCM4100 Analog Dev Kit (Intl) RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*