HI-3200, HI-3201
CAN Bus Immediate Transmit Option
The Host CPU may instruct the HI-3200 to transmit an
CAN frame immediately using a special SPI command.
The SPI command describes the CAN frame with 5 to 13
SPI data bytes. The bit format of the data bytes is exactly
the same as a Type 1 transmit descriptor, except the
Type Field of the header byte is “don’t care”.
If the CAN transmit sequencer is active, then the new
frame is transmitted to HI-3110 as soon as the current
frame has been sent. The sequencer then resumes
operation at the next location in the queue.
Both the RUN input pin and the Master Control Register
CANTX bit must be high to enable any CAN frame
transmission.
If the CAN transmit sequencer is not running (CTCR bit
RUN/STOP = “0”), or the sequencer is waiting for the
repetition rate counter to rollover, then the new CAN
frame is transmitted without delay.
Table 1 lists the host CPU SPI instruction format.
HOLT INTEGRATED CIRCUITS
37
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
