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EM6617 Datasheet(PDF) 29 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) 29 Page - EM Microelectronic - MARIN SA

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EM6617
Copyright
© 2005, EM Microelectronic-Marin SA
29
www.emmicroelectronic.com
9. Serial (Output) Write Buffer - SWB
The EM6617 has simple Serial Write Buffer which outputs serial data and serial clock.
Serial Write Buffer clock frequency is selected by bits
SWBFSel0 and SWBFSel1 in RegSWBCntl register. The
possible values are 1kHz (default), 2kHz, 8kHz or 16kHz.
The signal TestVar[3], which is used by the processor to make conditional jumps, indicates
"Transmission
finished" in automatic send mode or "SWBbuffer empty" in interactive send mode. In interactive mode, TestVar[3]
is equivalent to the interrupt request flags stored in
RegIRQ[i] registers : it permits to recognize the interrupt
source. (See also the interrupt handling section 13 for further information). To serve the "SWBbuffer empty "
interrupt request, one only has to make a conditional jump on TestVar[3].
The SWB data is output on the rising edge of the clock. Consequently, on the receiver side the serial data can be
evaluated on falling edge of the serial clock edge.
Normally the Clock and the Data output terminals are always driven to ‘0’ outside a SWB data transfer. With a
metal option one can put the Data output, the Clock output or both into a high impedance state outside of a SWB
transfer. Refer to 19.1.4 for the mask settings. The timing going into high impedance state into SWB transfer and
back into high impedance is depending on the selected mode, interactive or automatic.
Figure 22. Serial Write Buffer Architecture
Size[5:0]
Addr. Counter
RAM
SW B buffer
SW Bauto
SW BStart
SW BFSel0,1
Control
Logic
Shift register
DB[3:0]
Clk
Mux
SW B clock
SW B data
TestVar3
SW B buffer
register
IRQ (only in
interactive
SWB has two operational modes, automatic mode and interactive mode.
9.1 SWB Automatic send mode
Automatic mode enables a buffer on a predefined length to be sent at high transmission speeds up to ck[15]
(16kHz). In this mode user prepares all the data to be sent (minimum 8 bits, maximum 256 bits) in the RAM. The
user then selects the clock speed, sets the number of data nibbles to be sent, selects automatic transmission
mode (
SWBAuto 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
RegSWBuff 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 RegSWBSizeL,
RegSWBSizeH registers.


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