cp3bt13 National Semiconductor Corporation, cp3bt13 Datasheet - Page 82
cp3bt13
Manufacturer Part Number
cp3bt13
Description
Cp3bt13 Reprogrammable Connectivity Processor With Bluetooth-r And Can Interfaces
Manufacturer
National Semiconductor Corporation
Datasheet
1.CP3BT13.pdf
(232 pages)
- Current page: 82 of 232
- Download datasheet (3Mb)
www.national.com
Error Active
An error active unit can participate in bus communication
and may send an active (“dominant”) error flag.
Error Warning
The Error Warning state is a sub-state of Error Active to in-
dicate a heavily disturbed bus. The CAN module behaves
as in Error Active mode. The device is reset into the Error
Active mode if the value of both counters is less than 96.
Error Passive
An error passive unit can participate in bus communication.
However, if the unit detects an error it is not allowed to send
an active error flag. The unit sends only a passive (“reces-
sive”) error flag. A device is error passive when the transmit
error counter or the receive error counter is greater than
127. A device becoming error passive will send an active er-
ror flag. An error passive device becomes error active again
when both transmit and receive error counter are less than
128.
Bus Off
A unit that is bus off has the output drivers disabled, i.e., it
does not participate in any bus activity. A device is bus off
Special error handling for the TEC counter is performed in
the following situations:
T A stuff error occurs during arbitration, when a transmitted
T An ACK-error occurs in an error passive device and no
Receive Error Counter Conditions
A receiver detects a bit error during sending an active error flag.
A receiver detects a “dominant“ bit as the first bit after sending an error flag
After detecting the 14th consecutive “dominant“ bit following an active error flag or overload
flag, or after detecting the 8th consecutive “dominant“ bit following a passive error flag.
After each sequence of additional 8 consecutive “dominant” bits.
Any other error condition (stuff, frame, CRC, ACK)
A valid reception or transmission
Transmit Error Counter Conditions
A transmitter detects a bit error while sending an active error flag
After detecting the 14th consecutive “dominant“ bit following an active error flag or overload
flag or after detecting the 8th consecutive “dominant“ bit following a passive error flag.
After each sequence of additional 8 consecutive ‘dominant’ bits.
Any other error condition (stuff, frame, CRC, ACK)
A valid reception or transmission
“recessive” stuff bit is received as a “dominant” bit. This
does not lead to an increment of the TEC.
“dominant” bits are detected while sending the passive
error flag. This does not lead to an increment of the TEC.
Condition
Table 35 Error Counter Handling
82
when the transmit error counter is greater than 255. A bus
off device will become error active again after monitoring
128 × 11 “recessive” bits (including bus idle) on the bus.
When the device goes from “bus off“ to “error active“, both
error counters will have a value of 0.
16.2.5
There are multiple mechanisms in the CAN protocol to de-
tect errors and inhibit erroneous modules from disabling all
bus activities. Each CAN module includes two error
counters to perform error management. The receive error
counter (REC) and the transmit error counter (TEC) are 8-
bits wide, located in the 16-bit wide CANEC register. The
counters are modified by the CAN module according to the
rules listed in Table 35. This table provides an overview of
the CAN error conditions and the behavior of the CAN mod-
ule; for a detailed description of the error management and
fault confinement rules, refer to the CAN Specification 2.0B.
If the MSB (bit 7) of the REC is set, the node is error passive
and the REC will not increment any further.
The Error counters can be read by application software as
described under CAN Error Counter Register (CANEC) on
page 105.
T If only one device is on the bus and this device transmits
a message, it will get no acknowledgment. This will be
detected as an error and the message will be repeated.
When the device goes “error passive” and detects an ac-
knowledge error, the TEC counter is not incremented.
Therefore the device will not go from ”error passive” to
the “bus off” state due to such a condition.
Error Counters
Increment by 8
Increment by 8
Increment by 8
Increment by 1
Decrement by 1 unless
counter is already 0
Increment by 8
Increment by 8
Increment by 8
Decrement by 1 unless
counter is already 0
Action
Related parts for cp3bt13
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Freescale Semiconductor Technical Data
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Self-calibrating 12-bit Plus Sign Serial I/o A/d Converters With Mux And Sample/hold
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Pllatinum Tm Fractional N Rf / Integer N If Dual Low Power Frequency Synthesizer
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Pllatinum? 2.0 Ghz Frequency Synthesizer For Rf Personal Communications
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Pllatinumtm 160 Mhz Frequency Synthesizer For Rf Personal Communications
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Dual N-channel Enhancement Mode Field Effect Transistor
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Video Amplifier System (obsolete)
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Synchronous Step-up DC/DC Converter For White Led Applications
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
CLC420 - High Speed, Voltage Feedback op Amp, Package: Lcc, Pin Nb=20
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Monolithic Triple 4.5 CRT Driver
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Differential Video Amplifier
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
ADC10061 - 10-Bit 600 NS A/D Converter With Input Multiplexer And Sample/Hold, Package: Soic Wide, Pin Nb=20
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
DS36277 - Dominant Mode Multipoint Transceiver, Package: Soic Narrow, Pin Nb=8
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Printer Solenoid Driver
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Quad High Speed Trapezoidal Bus Transceiver
Manufacturer:
National Semiconductor Corporation
Datasheet: