Bits 7 to 4: Reserved.
This field is a priority encoded state vector that can be read by the host and used
as an index into an interrupt service routine table. If an interrupt is pending, the value in this field corresponds to the highest priority
pending interrupt. The state vector encoding is defined as shown in Table 8-3.
__________________________________________________________________________________________________________ 8-10
ISVEC[3:0] INTERRUPT STAT US
0 A wake-up reques t w as detected on the LIN bus while the per i pheral w as in the low- power s leep mode.
1
Activity was detected on the LIN bus while the peripheral was in the low-power s leep state. This condition is only set if the PM bit
(CNT2.3) is set to 1.
2
In slave mode, this vector indicates that a header was received with a protected identifier that was w ithin a valid range ( i.e., an always
valid frame or one that passed the fi lter check specified by the IDFBH and IDFBL fields). In master mode, this vector indicates that the
protected identifier has been success fully transm itted.
3 Buffer overrun. This condition is set when a byte of data is received and there is no room in the receive FIFO.
4
Other communications er ror. This condition is set when a communication error occurs that is not explicitly assigned to another state
vector.
5 Reserved. This condition is never set.
6
Partial frame received successfully. This condition is set whenever the amount of data in the receive FIFO exceeds the threshold
configured by the RXFT[1:0] field (FCON .3:2).
7 Reserved. This condition is never set.
8
Com p lete fra me received successfully. This condition is set when the last byte of a frame has been received and the checksum is
valid.
9 Reserved. This condition is never set.
10
Partial frame transmitted successful ly. This condition is set whenever the amount of data in the transm it FIFO falls below the threshold
configured by the TXFT[1:0] field (FCON.5:4).
11
Com p lete fra me transm itted successfully. This condition is set whenever the last byte of a frame has been transmitted and no errors
occurred on the bus during the transm ission.
12
No master response. This condition is set if the peripheral is is suing wake-up requests on the bus and there is no response from the
master.
13 No bus activity. This condition is set if the bus is i d le for a period of mo r e than 4 seconds .
14 Reserved. This condition is never set.
15 No pending inter rupt. This condition is set when there are no pending interrupts.
(114 paginas)
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