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EM6617 Datasheet(PDF) 30 Page - EM Microelectronic - MARIN SA

Part No. EM6617
Description  Ultra Low Power Microcontroller with ADC AND EEPROM
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Maker  EMMICRO [EM Microelectronic - MARIN SA]
Homepage  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6617 Datasheet(HTML) 30 Page - EM Microelectronic - MARIN SA

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EM6617
Copyright
© 2005, EM Microelectronic-Marin SA
30
www.emmicroelectronic.com
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 EM6617 leaves standby mode (INTEN is automatically
Enabled) and sets TestVar[3] high. TestVar[3] = 1 is signaling SWB transmission is terminated.
As soon as SWBAuto is high, the general IntEn flag is disabled until the SWBAuto goes back low.
After automatic SWB transmission INTEN bit becomes high. Although set to 1 via the Halt instruction the bit
INTEN is disabled throughout the whole SWB automatic transmission. It resumes to 1 at the end of transmission.
The data to be sent must be prepared in the following order:
First nibble to be sent must be written in the
RegSWBuff register . The other nibbles must be loaded in the RAM
from address 00 (second nibble at adr.00, third at adr.01,...) 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 together with RegSWBuff up to 64
nibbles (256 bits) of data to be sent. The minimum amount of data bits one can send in automatic SWB mode is 8 .
In this case the last RAM address to be sent is 00 ("size" = 00).
Once data are written into the RAM and into the RegSWBuff, the user has to load the "
size" (adr. of the last nibble
to be send - bits size[5 :0]) into the
RegSWBSizeL and RegSWBSizeH register, later register together with
SWBAuto =1 bit.
Now everything is ready for automatic serial transmission. To start the transmission one has to put the EM6617 in
standby mode with the HALT instruction. When transmission is finished TESTvar[3] (can be used for conditional
jumps) becomes active High, the bit
SWBAuto is cleared , the processor is leaving the Standby mode and IntEn
is switched on.
The processor now starts to execute the first instruction placed after the HALT instruction (for instance write of
RegSWBuff register to clear TESTvar[3]), except if there was a IRQ during the serial transmission. In this case the
CPU will go directly in the interrupt routine.
TestVar[3] stays high until
RegSWBuff is rewritten. Before starting a second SWB action this bit must be cleared
by performing a dummy write on
RegSWBuff address.
Figure 23. Automatic Serial Write Buffer Transmission
Because the data in the RAM are still present one can start transmitting the same data once again only by
recharging the RegSWBuff , RegSWBSizeL and RegSWBSizeH register together with SWBAuto bit and putting
the EM6617 in HALT mode. This will start a new transmission.
Using the SWB high impedance mask option in automatic mode. As soon as one goes into Halt mode the SWB
outputs go to ‘0’ and SWB transfer starts. At the end of the transfer the SWB outputs go immediately back into
high impedance state.


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