CAN Controllers and Acceptance Filter 212 May 03, 2004
Philips Semiconductors Preliminary User Manual
LPC2119/2129/2292/2294ARM-based Microcontroller
Semaphore Procedure for Reading an Auto-Stored Message
Start
Read 1st word
SEM == 01?
Read 2nd and
3rd words
Read 1st word
SEM == 00?
SEM == 11?
Most recently read 1st, 2nd, and 3rd words are from the same message
Clear SEM, write
back 1st word
This message has not been
received since last check.
no
yes
yes
no