收藏本站
Chapter 4 Operational Phases and Modes of Operation
4.1
Modes of operation
The V1 ColdFire core supports RUN, HALT, RESET and STOP modes natively. These are present on any
ColdFire-based product. The MCU integration adds additional controls to STOP mode, effectively
creating three modes where one existed previously.
The set of modes then becomes:
RUN The CPU executes instructions in this mode that can be further subdivided into
User and Supervisor modes.
HALT Version 1 ColdFire Core HALT/DEBUG mode
RESET Reset asserted. Circuitry in default state. RESET can be divided into several
phases of operation. For details, see “System Integration Module” on page 189 .
STOP FC
STOP SC
STOP NC
4.2
STOP – Clock in Fast Mode – Nominally used for ? A (See “Overview” on
page 35. )
STOP – Clock in Low Speed Mode – Nominally used for ? I (See “Overview” on
page 35. )
STOP – No clocks – All clocks disabled. Nominally used for the SLEEP phase.
Frame structure
In addition to the modes above, the MMA955xL platform is designed to facilitate a “frame-based”
software scheduler. Analog sensor conversions are best executed when the CPU is quiet and there may be
times when both AFE and CPU are dormant. The MMA955xL device includes hardware mechanisms to
make it easy to schedule these different functions.
4.3
Overview
The MMA955xL platform can be programmed to take a continuous sequence of evenly spaced samples
over time. This section specifies the terms for timing and phases. Figure 4-1 on page 36 , Figure 4-2 on
page 36 and Figure 4-3 on page 36 illustrate a number of these terms that will be subsequently defined.
Timing is defined in terms of “frames.” There are two types of frames: Sample and non-sample. Sample
frames include an analog phase in which sensor outputs are sampled. Non-sample frames simply omit the
analog phase.
Output Data Rate (ODR), Frame Rate (FR) and Sample Data Rate (SDR) are three important terms that
will be used throughout the following text.
ODR < SDR < FR
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
35
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

*
*
*
相关PDF资料
KITMMA955XLEVM KIT EVALUATION FOR MMA955XL
KITMPL115A1EVB KIT EVALUATION FOR MPL115A1
KITMPL115A1SPI KIT EVALUATION FOR PL115A1SP1
KITMPL115A2I2C KIT EVALUATION FOR PL115A2I2C
KITMPVZ5004EVK KIT EVAL PRESSURE SENS BOARD
KN500B1/4 SWITCH KNOB STRAIGHT .50" BLACK
KN5700B1/4 SWITCH KNOB STRAIGHT .75" BLACK
KN700B1/4 SWITCH KNOB STRAIGHT .75" BLACK
相关代理商/技术参数
KITMMA9551LEVM 功能描述:加速传感器开发工具 Dev Board MMA9551L RoHS:否 制造商:Murata 工具用于评估:SCA3100-D04 加速:2 g 传感轴:Triple Axis 接口类型:SPI 工作电压:3.3 V
KITMMA955XLEVM 功能描述:加速传感器开发工具 EVM KIT FOR MMA955XL RoHS:否 制造商:Murata 工具用于评估:SCA3100-D04 加速:2 g 传感轴:Triple Axis 接口类型:SPI 工作电压:3.3 V
KITMMDS08AB32 功能描述:DEV KIT FOR 68HC908AB32 MMDS RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
KITMMDS08JB8 功能描述:DEV KIT FOR 68HC908JB8 MMDS RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
KITMMDS08JL 功能描述:DEVKIT 68HC908JL3/JK3/JK1 MMDS RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
KITMMDS08KX 功能描述:DEV KIT FOR 68HC908KX8/KX2 MMDS RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
KITMMDS08MR32 功能描述:DEVKIT FOR 68HC908MR32/MR16 MMDS RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
KITMMEVS08AB32 功能描述:DEV KIT FOR 68HC908AB32 MMEVS RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP