CP3SP33SMSSLASHNOPB datasheet(213/407 Pages) TI1

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CP3SP33

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SNOSCW5 – MAY 2013

Example 2

PSC = PSC[5:0] + 1 = 2 + 2 = 4

TSEG1 = TSEG1[3:0] + 1 = 1 + 1 = 2

TSEG2 = TSEG2[2:0] + 1 = 0 + 1 = 1

SJW = TSEG2 = 1

•

Sample point positioned at 75% of bit time

•

Bit time = 250 ns × (1 + 2 + 1 ± 1) = (1 ± 0.25) µs

•

Bus Clock = 16 MHz / (2 × (1 + 4 + 3)) = 1Mbit/s (nominal)

22.11.5 Acceptance Filter Considerations

The CAN module provides two acceptance filter masks GMSKn and BMSKn, as described in

Section 22.4, Section 22.10.8, and Section 22.10.9. These masks allow filtering of up to 32 bits of the

message object, which includes the standard identifier, the extended identifier, and the frame control bits

RTR, SRR, and IDE.

22.11.6 Remote Frames

Remote frames can be automatically processed by the CAN module. However, to fully enable this feature,

the RTR/ XRTR bits (for both standard and extended frames) within the BMSKn and/or GMSKn register

need to be set to “don’t care”. This is because a remote frame with the RTR bit set should trigger the

transmission of a data frame with the RTR bit clear and therefore the ID bits of the received message

need to pass through the acceptance filter. The same applies to transmitting remote frames and switching

to receive the corresponding data frames.

22.12 Usage Notes

Under certain conditions, the CAN module receives a frame sent by itself, even though the loopback

feature is disabled. Two conditions must be true to cause this malfunction:

•

A transmit buffer and at least one receive buffer are configured with the same identifier. Assume this

identifier is called ID_RX_TX. With regard to the receive buffer, this means that the buffer identifier and

the corresponding fi ter masks are set up in a way that the buffer is able to receive frames with the

identifier ID_RX_TX.

•

The following sequence of events occurs:

1. A message with the identifier ID_RX_TX from another CAN node is received into the receive buffer.

2. A message with the identifier ID_RX_TX is sent by the CAN module immediately after the reception

took place.

When these conditions occur, the frame sent by the CAN module will be copied into the next receive

buffer available for the identifier ID_RX_TX.

If a frame with an identifier different to ID_RX_TX is sent or received in between events 1 and 2, the

problem does not occur.

23 Analog-to-Digital Converter

The ADC provides the following features:

•

10-input analog multiplexer

•

10 single-ended channels or 5 differential channels

•

External filtering capability

•

12-bit resolution with 10-bit accuracy

•

Sign bit

•

10-microsecond conversion time

•

Internal or external start trigger

Analog-to-Digital Converter

213

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