HI-3110
CONTROL REGISTER 1: CTRL1
TX1MOSM
CLKDCIVL1KDIV0
(Write, SPI Op-code 0x16)
(Read, SPI Op-code 0xD4)
7
6
5
4
3
2
1
0
LSB
MSB
Bit Name
R/W Default Description
7
TXEN
R/W
0
Transmission Enable.
This bit is logically ORed with theTXEN pin. When this bit is asserted, each message in the
FIFO will be sequentially loaded to the transmit buffer and sent if the bus is available. If this bit
is not set, a transmission can be enabled by either theTXEN pin or theTX1M bit. If theTXEN
pin is pulled low during a transmission, the current message being transmitted will be
completed. Any additional messages in the FIFO will not be transmitted.
1
=
Enable transmission and send any messages in FIFO (until
empty ifTXEN is held set).
0
=
Wait for transmission enable orTX1M bit set before sending next
message in FIFO.
6
5
TX1M
R/W
R/W
0
0
Enable transmission of only next message.
This bit is applicable only ifTXEN = 0. It is reset automatically upon completion of a successful
transmission or by initiation of transmission if the OSM bit is set.
1
0
=
=
Enable transmission of only next message in FIFO whenTXEN = 0.
Wait for transmission enable orTX1M bit set before sending next
message in FIFO.
OSM
One-Shot Mode Enable.
If enabled, the controller transmits only once and does not attempt re-transmission upon loss
of arbitration or error. This feature is necessary to support the implementation of fixed time
slots in theTime-Triggered CAN standard (TTCAN).
1
0
=
=
Enable one-shot mode.
Messages will re-transmit according to CAN protocol.
4
FILTON
R/W
0
Filter on enable.
This bit is set to turn on the HI-3110 CAN ID filtering mechanism. The default after reset is
FILTON = 0, meaning filtering is turned off and every valid CAN message is accepted into the
receive FIFO. Note: The device must be in initialization mode in order to program the
acceptance filters and masks.
1
0
=
=
Enable CAN ID filtering.
No CAN ID filtering (every valid message accepted into
receive FIFO).
3
2
OSCOFF
Not used
R/W
0
Oscillator off. This bit should be set to a one if an external clock is used. In this case the
external clock is connected to the OSCIN pin and OSCOUTshould be left floating.
1
0
=
=
Shuts off external OSCOUTpin.
OSCOUTpin enabled.
R/W
R/W
0
1-0 CLKDIV1:0
00
External CLKOUT division bits <1:0>
00: Divide by 1.
01: Divide by 2.
10: Divide by 4.
11: Divide by 8.
HOLT INTEGRATED CIRCUITS
18
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
