mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 519

• Manufacturer Part Number: mc9s12xf512
• Description: S12x Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

13.5.2.54 Receive FIFO Depth and Size Register (RFDSR)
Write:
This register defines the structure of the selected FIFO, i.e. the number of entries and the size of each entry.
13.5.2.55 Receive FIFO A Read Index Register (RFARIR)
This register provides the message buffer header index of the next available receive FIFO A entry that the
application can read.
Freescale Semiconductor
Module Base + 0x008A
Module Base + 0x008C
Reset
Reset
FIFO_DEPTH
ENTRY_SIZE
RDIDX
W
W
Field
SIDX
Field
R
R
Field
15–8
9–0
9–0
6–0
POC:config
15
15
0
0
0
Start Index — This field defines the number of the message buffer header field of the first message buffer of the
selected receive FIFO. The FlexRay block uses the value of the SIDX field to determine the physical location of
the receiver FIFO’s first message buffer header field.
Read Index — This field provides the message buffer header index of the next available receive FIFO message
buffer that the application can read. The FlexRay block increments this index when the application writes to the
FNEAIF flag in the
message buffer header index if the end of the FIFO was reached.
FIFO Depth — This field defines the depth of the selected receive FIFO, i.e. the number of entries.
Entry Size — This field defines the size of the frame data sections for the selected receive FIFO in 2 byte
entities.
14
14
0
0
0
13
13
0
0
0
Figure 13-54. Receive FIFO Depth and Size Register (RFDSR)
Figure 13-55. Receive FIFO A Read Index Register (RFARIR)
FIFO_DEPTH
12
12
0
0
0
Global Interrupt Flag and Enable Register
MC9S12XF - Family Reference Manual, Rev.1.19
11
11
Table 13-66. RFARIR Field Descriptions
0
0
0
Table 13-65. RFDSR Field Descriptions
Table 13-64. RFSIR Field Descriptions
10
10
0
0
0
9
0
0
9
8
0
0
8
Description
Description
Description
7
0
0
0
7
Chapter 13 FlexRay Communication Controller (FLEXRAY)
(GIFER). The index wraps back to the first
6
0
6
0
5
0
0
5
RDIDX
4
0
0
4
ENTRY_SIZE
3
0
0
3
2
0
0
2
1
0
1
0
0
0
0
0
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