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| 型号： | EM6640SO18A |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-SOIC |
| 中文描述： | 微控制器 |
| 文件页数： | 26/62页 |
| 文件大小： | 620K |
| 代理商： | EM6640SO18A |
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EM6640
03/02 REV. C/446
Copyright
2002, EM Microelectronic-Marin SA
32
www.emmicroelectronic.com
8.1.2 How the SWB in automatic mode works
Data to be sent must be prepared in the following order:
1st:
First 4-bit package must be written in RegSWBuff register.
2nd:
Other 4-bit packages must be loaded in the RAM from address 0
==> second package at address 0,
third at address 1... (the maximum address space for SWB is 3E hex ==> 64 4-bit packages = 256 bits).
3rd:
One has to load the data size (address of the last 4-bit package) into RegSWBSizeL and RegSWBSizeH
registers and has to set to “1“ at the same time the bit SWBAuto. Therefore, the number of 4-bit
packages which can be sent ranges from 2 (size = 0) to 64 (size = 3E hex).
4th:
To start the transmission, one has to put the EM6640 in HALT mode.
At the end of transmission, write any data to RegSWBuff in order to clear TESTvar[3] which allows the SWB to
be written again.
By writing SWBAuto to “1“, general interrupt enable flag IntEn is disabled until the end of SWB transmission and
therefore no interrupt can occur before transmission ends. Consequently, a HALT command should follow a
SWBAuto write in order not to miss any interruptions. When the transmission is finished, the bit SWBAuto is
cleared and TESTvar[3] goes high and stays at this level until RegSWBuff register is written.
SysClk is shown two times longer for a better visibility !
Figure 24 Automatic Serial Write Buffer transmission
At the end of transmission the general interrupt enable flag IntEn is set to its active high state again when HALT
becomes inactive. An internal START signal enables the CPU to come out of HALT and execute the following
instruction. However if an interrupt occurs during SWB transmission, the CPU will service this first.
One can restart the transmission with the same data by simply reloading the register RegSWBuff and then the
registers RegSWBSizeL and RegSWBSizeH (with bit SWBauto set to “1“), disabling the general interrupt enable
flag and putting again the EM6640 into HALT mode.
相关PDF资料 |
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相关代理商/技术参数 |
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| EM6640SO18B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6640TP16A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6640TP16B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6640WP11 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Low Power Microcontroller with EEPROM AND RC Oscillator |
| EM6640WP27 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Low Power Microcontroller with EEPROM AND RC Oscillator |
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