PXD20RM Datasheet, PDF (970/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

If at least one active filter is configured as TX, all received identifiers matching this filter generate a TX
interrupt.
If at least one active filter is configured as RX, all received identifiers matching this filter generate an RX
interrupt.
If no active filter is configured as RX, all received identifiers not matching TX filter(s) generate an RX
interrupt.
Further details are provided in Table 27-4 and Figure 27-10.
Table 27-4. Filter to interrupt vector correlation
Number of active
filters
Number of active Number of active
filters configured as filters configured as
TX
RX
Interrupt vector
0
a
(a > 0)
n
(n = a + b)
0
a
a
(a > 0)
b
0
(b > 0)
0
0
b
(b > 0)
b
- RX interrupt on all IDs
- TX interrupt on IDs matching
the filters,
- RX interrupt on all other IDs if
BF bit is set, no RX interrupt if
BF bit is reset
- TX interrupt on IDs matching
the TX filters,
- RX interrupt on IDs matching
the RX filters,
- all other IDs discarded (no
interrupt)
- RX interrupt on IDs matching
the filters,
- TX interrupt on all other IDs if
BF bit is set, no TX interrupt if
BF bit is reset
+
IFMI
MESSAGE0
@
MESSAGE1
DATA
Pointers
Table
RAM
MESSAGE2
Figure 27-10. Identifier match index
27-14
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor