E981.03 Datasheet, PDF (22/51 Pages) ELMOS Semiconductor AG – Autonomous MAC and individual physical address

KNX/ EIB TRANSCEIVER
PRODUCTION DATA - JAN 15, 2015
E981.03
6.7 Busy Mode
If the host controller is temporarily not able to receive
telegrams from the bus (e.g. due to no code execution
during flash erase), the Busy Mode can be estimated to
reject frames from the bus with BUSY acknowledges
independently from host acknowledge information in
KNX Busy Mode.
Activation
Busy Mode can be activated if
• no higher prior mode is active (e.g. reset, startup)
and
• the CMODE register has the Busy Mode value
Busy Mode activation during active Busy Mode is ig-
nored. The Busy Mode duration is not prolongated.
Busy Mode activation in active Bus monitor mode is
not supported.
The CMODE register can be modified by
• sending a U_ActivateBusyMode service request via
UART or
• writing to the CMODE register via SPI or UART
Deactivation
Busy Mode can be left for
• any higher prior mode (e.g. reset) if the activation
condition for that modes holds or
• another CMODE controlled mode in case of CMODE
value change
• the CMODE register can be modified by
- sending an U_Ackinfo or an U_ResetBusyMode
service request via UART or
- writing to the CMODE register via SPI or UART or
- internal logic when reaching timeout defined by
register BUSY_REG
- after timeout of defined in Register BUSY_REG.
Properties
• the IC is in full function (all supplies may be
switched on)
• KNX/ EIB, UART and SPI interfaces are active (de-
pendent on their control register contents)
but E981.03 rejects following telegrams from the bus
with BUSY acknowledges
1) individually addressed telegrams with their destina-
tion address matching the individual address stored in
the registers (Addressed Mode only)
2) all group telegrams including broadcast
All other frames will not be acknowledged with BUSY.
All received telegrams are sent byte-wise from E981.03
to the host.
Remark
Busy Mode activation in active Bus Monitoring Mode is
not supported. The IC would switch from Bus Monitor-
ing Mode to Busy Mode but BUSY acknowledging will
be delayed.
6.8 Normal Mode
Activation
The Normal Mode is active if
• no higher prioritized mode is active (e.g. reset,
start-up) and
• the CMOD register has the Normal Mode value
Deactivation
The Normal Mode will be left for
• any higher prior mode (e.g. reset) if the activation
condition for that modes holds or
• another CMOD controlled mode in case of CMOD
value change
Properties
• the IC is in full function (all supplies may be
switched on)
• KNX/ EIB, UART and SPI compatible interfaces are
active (dependent on their control register con-
tents)
• UART is in normal (full) mode as long as UART is not
switched off by SPI access
• all UART services are available
All received telegrams are sent byte-wise from E981.03
to the host.
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
22/51