CDC3205G-C Micronas, CDC3205G-C Datasheet - Page 182

• Manufacturer Part Number: CDC3205G-C
• Description: Automotive Controller Family The Device is a Microcontroller For Use in Automotive Applications.the On-chip Cpu is an Arm Processor ARM7TDMI with 32-bit Data And Address Bus, Which Supports Thumb format Instructions.
• Manufacturer: Micronas

CDC 32xxG-C
CO. If a rescan is initiated, the BI also starts from the begin-
ning with the transmit search.
27.3.7.1. Buffers
Several successive receive COs may be allocated with the
same identifier. The BI stores a received Tg in the first free
Rx-CO. Using this mechanism it is possible to construct a
receive buffer. If RIE is set in the last CO, the CPU is not
informed until the buffer is full.
27.3.7.2. Basic/Full CAN
For a Basic CAN application, a single Tx-CO will be used. All
outgoing telegrams will be transmitted with this. The user
must receive all Rx-Tgs and must himself decide whether he
needs it (acceptance filtering). For this case it is possible to
use an Rx-All-CO. But it is necessary to ensure that this can
be processed before the next Tg arrives.
For this reason, it is a good idea to employ 2 or 3 Rx-All-COs
as buffers after the Tx-CO.
In the case of a FullCAN application, one uses the built-in
acceptance filtering and sets up a CO specifically for each
desired Rx-Tg and Tx-Tg.
If the CAN-RAM is not big enough, mixed strategies are also
possible. The acceptance filtering, of course, burdens the
CPU with communication tasks.
Fig. 27–7:
180
TD:
CM=Send
TD:
CM=
Rec. All
TD:
CM=
Rec. All
TD:CM = 7
Example: CA of a BasicCAN with 2 Rx-buffers
Tx-Obj
Rx-Obj
Rx-Obj
End of Com. Area
June 12, 2003; 6251-579-1PD
Fig. 27–8:
Tx-objects, and 2 Rx-buffers
TD:
CM=
Receive
TD:
CM=Send
TD:
CM=Send
TD:
CM=
Receive
TD:
CM=
Rec. All
TD:
CM=
Rec. All
TD:CM = 7
Example: CA of a FullCAN with 2 Rx-objects, 2
Rx-Obj
Tx-Obj
Tx-Obj
Rx-Obj
Rx-Obj
Rx-Obj
End of Com. Area
PRELIMINARY DATA SHEET
Micronas