E981.03 Datasheet, PDF (21/51 Pages) ELMOS Semiconductor AG – Autonomous MAC and individual physical address

KNX/ EIB TRANSCEIVER
PRODUCTION DATA - JAN 15, 2015
E981.03
6.5 Analog Mode
Activation
Analog Mode is activated if
• no higher prioritize mode is active (e.g. reset,
starup) and the baud rate select pins BS0 and BS1
have both high level
Deactivation
Analog Mode will be left for
• a higher prior mode (e.g. reset) if the activation
condition for that modes holds or
• Normal Mode if any of the baud rate select pins has
low level
Properties
• IC is fully functional (all supplies active)
• host UART interface is switched off.
No UART service is available
• bypass from KNX transceiver to UART transceiver
is active
• host SPI interface is active (may be switched off by
host processor)
comparable to 'Medium Attachment Unit (MAU)'
KNX standard: Volume 3 System Specifications: Physical Layer
General
6.6 Monitoring Mode
Activation
Monitor mode can be activated if
• no higher prioritize mode is active (e.g. reset,
startup, busy) and
• the CMODE register has the Bus monitor mode
value
The CMODE register can be modified by
• sending a U_ActivateBusmon service request via
UART or
• writing to the CMODE register via SPI or UART
Deactivation
Bus monitor mode can be left for any higher prioritize
mode (e.g. reset) if the activation condition for that
modes holds.
Switching to Busy Mode is not possible in Bus monitor
mode.
Properties
• The data link layer of the UART is in bus monitor
mode. Only the local L_Busmon service is available
for the host processor. All L_Data host to E981.03
services including L_Poll_Data service are not avail-
able and will be ignored.
• Each byte received on the KNX / EIB is sent to the
host as well as illegal control bytes and all acknowl-
edge frames.
• E981.03 is quiet (not sending) on the KNX bus.
• Writing to the telegram buffers in Bus Monitoring
Mode is possible.
• The transmit frame buffer content will not be trans-
mitted to the KNX bus in Bus Monitoring Mode.
• U_Reset.request clears the transmit buffer ready
flag (Flag READY in Register KNX_TR_BUF_STAT).
Leaving Bus Monitoring Mode without clearing this
flag results in transmission of the transmit buffer
content on KNX bus.
• Alarm telegrams can be transmitted even in Bus
Monitor Mode.
All received telegrams are sent byte-wise from E981.03
to the host.
Switching to Busy Mode is not allowed in Bus Monitor-
ing Mode. Bus Monitoring Mode will be deactivated on
activation of Busy Mode.
It is recommended to activate and deactivate Bus Mon-
itoring Mode using UART service requests. Activation
using direct register access will be described in an ap-
plication note.
Elmos Semiconductor AG reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
Elmos Semiconductor AG
Data Sheet
QM-No.: 25DS0046E.03
21/51