參數(shù)資料
型號： EM6605TP24B
英文描述： Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0&degC to 70°C; Package: 8-SOIC
中文描述： 微控制器
文件頁數(shù)： 16/39頁
文件大?。?/td> 675K
代理商： EM6605TP24B
EM6603
03/02 REV. G/439
Copyright
2002, EM Microelectronic-Marin SA
23
www.emmicroelectronic.com
11.1 SWB Automatic send mode
Automatic mode enables a buffer on a predefined length to be sent at high transmission speeds ( up to 16khz).
In this mode user prepares all the data to be sent (minimum 8 bits, maximum 256 bits) in RAM. The user then
selects the clock speed, sets the number of data nibbles to be sent, selects automatic transmission mode
(AutoSWB bit set to 1) and enters STANDBY mode by executing a HALT instruction. Once the HALT
instruction is activated the SWB peripheral module sends the data in register SWBuff followed by the data in
the RAM starting at address 00 up to the address specified by the bits size[5:0] located in the LowSWB,
HighSWB registers.
During automatic transmission the general INTEN bit is disabled automatically to prevent other Interrupts to
reset the standby mode. At the end of automatic transmission EM6603 leaves standby mode and sets
TestVar[3] high. TestVar[3] = 1 is signaling SWB transmission is terminated. Once the transmission is finished,
do not forget to enable the general INTEN bit if necessary.
The data to be sent must be prepared in the following order:
First nibble to be sent must be written in the SWBuff register . The other nibbles must be loaded in the RAM
from address 0 (second nibble at adr.0, third at adr.1,...) up to the address with last nibble of data to be send =
"size" address. Max. address space for SWB is 3E ("size" 3E hex) what gives with SWBuff up to 64 nibbles
(256 bits) of possible data to be sent. The minimum possible data length we can send in Automatic SWB mode
is 8 bits when the last RAM address to be sent is 00 ("size" = 00)
Once data are ready in the RAM and in the SWBuff, user has to load the "size" (adr. of the last nibble to be
send - bits size[5:0]) into the LowSWB and HighSWB register together with AutoSWB bit = 1.
Now everything is ready for serial transmission. To start the transmission one has to put the EM6603 in standby
mode with the HALT instruction. With this serial transmission starts. When transmission is finished the
TESTvar[3] (can be used for conditional jumps) becomes active High, the AutoSWB bit is cleared, the
processor is leaving the Standby mode and INTEN is switched on.
Figure 13.Automatic Serial Write Buffer transmission
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