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Chapter 13
FCAN Interface Function
Preliminary User’s Manual U14913EE1V0UM00
13.5 CAN
Bridge
ELISA
13.5.1 Principle of operation
ELISA is the name of an event processor, a sophisticated machine that supports the CPU on data
transfer between different CAN buses and on time management functions.
The operations done by ELISA are based on user-programmable sequences of commands. The com-
mands are stored in the CAN memory. The commands are numbered by their location in the CAN
memory. The command with the lowest physical address is defined to be command 1, the next to be
command 2, etc. ELISA executes commands sequentialy from lower command number to the higher
command number.
The event pointers (refer to chapter 13.3.4 (9)Message event registers m0, m1, and m3 (M_EVTm0,
M_EVTm1, M_EVTm3) (m = 00 to 63)) link a message object to the start of a command sequence to
be executed if an event occurs. ELISA continuously checks the event request flag (ERQ) of all message
buffers (M_STATm register, m = 00 to 63). Whenever the ERQ flag of a particular message buffer is set,
ELISA loads the related event pointer and executes commands starting with the command that is
addressed by the event pointer. ELISA will end its processing when executing a command with the END
flag set.
Remark:
In the V850E/CA1 (Atomic) an event command list executed by a certain event must only
contain 8 event commands. In case the list contains more than 8 commands the CAN bridge
ELISA stops execution after the 8
th
command automatically.
Summary of Contents for V850E/CA1 ATOMIC
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