Bosch TTCAN - TTCAN TT Matrix Limits1 Register; TTCAN TT Matrix Limits2 Register

User’s Manual
BOSCH
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Revision 1.6TTCAN
11.11.02
manual_about.fm
EECS Enable External Clock Synchronisation
one TUR Configuration (NumCfg only) may be updated during
TTCAN operation.
zero TUR Configuration may not be updated.
TTMode TTCAN Operation Mode
0x0 TTMode_0 Event driven CAN Communication (default mode).
0x1 TTMode_1 Configuration Mode.
0x2 TTMode_2 Strictly Time Triggered Operation.
0x3 TTMode_3 Event Synchronised Time Triggered Operation.
Note : The CPU may write to the TT Operation Mode register only during initialisation (Init and CCE
are set). Configuration Mode enables the write access to the other TTCAN configuration regis-
ters. The whole CAN module remains in initialisation mode while TTMode is TTMode_1, “Con-
figuration Mode”, even if Init is reset.
The following registers require TTMode_1 “Configuration Mode” to be writable :
3.5.4 TT Matrix Limits1 Register (addresses 0x2B & 0x2A)
ETT Expected Tx_Trigger
0x000-0xfFF Expected number of Tx_Triggers in one matrix cycle.
3.5.5 TT Matrix Limits2 Register (addresses 0x2D & 0x2C)
RDLC Reference Message Data Length Code
0x0 invalid value.
0x1-0xF DLC of Reference Message to transmit when Time Master.
TEW Tx_Enable Window
0x0-0xF Length of Tx_Enable Window.
Name Reset Value Function
Trigger Memory Access 0x0000 Defines communication schedule
TT Operation Mode15-2 0x0000 Time mastership, clock control
TT Matrix Limits1 0x0000 Number of transmissions
TT Matrix Limits2 0x0000 Length of cycle components
TT Application Watchdog 0x0001 Watchdog service interval
TUR-NumeratorCfg 0x0000 Length of NTU
TUR-DenominatorCfg 0x1000 Length of NTU
Clock Control15-8 0x0000 Clock calibration, stopwatch, TMI
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
res ETT
rrw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RDLC TEW res CCM
rw rw r rw