mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 333

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Read: Anytime
Write: Anytime in initialization mode (INITRQ = 1 and INITAK = 1), except bits IDHITx, which are
read-only
The IDHITx indicators are always related to the message in the foreground buffer (RxFG). When a
message gets shifted into the foreground buffer of the receiver FIFO the indicators are updated as well.
15.3.12 MSCAN Miscellaneous Register (CANMISC)
This register provides additional features.
Freescale Semiconductor
IDHIT[2:0]
IDAM[1:0]
Field
5:4
2:0
Reset:
W
R
Identifier Acceptance Mode — The CPU sets these flags to define the identifier acceptance filter organization
(see
mode, no message is accepted such that the foreground buffer is never reloaded.
Identifier Acceptance Hit Indicator — The MSCAN sets these flags to indicate an identifier acceptance hit (see
Section 15.5.3, “Identifier Acceptance
IDAM1
IDHIT2
Section 15.5.3, “Identifier Acceptance
0
0
7
0
0
1
1
0
0
0
0
1
1
1
1
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Figure 15-15. MSCAN Miscellaneous Register (CANMISC)
= Unimplemented
Table 15-16. CANIDAC Register Field Descriptions
Table 15-17. Identifier Acceptance Mode Settings
6
0
0
Table 15-18. Identifier Acceptance Hit Indication
IDHIT1
IDAM0
0
1
0
1
0
0
1
1
0
0
1
1
0
0
5
Filter”).
IDHIT0
Filter”).
0
1
0
1
0
1
0
1
Table 15-18
4
0
0
Description
Table 15-17
Identifier Acceptance Mode
Four 16-bit acceptance filters
Two 32-bit acceptance filters
Eight 8-bit acceptance filters
summarizes the different settings.
Filter closed
0
0
3
Identifier Acceptance Hit
summarizes the different settings. In filter closed
Freescale’s Controller Area Network (MSCANV1)
Filter 0 hit
Filter 1 hit
Filter 2 hit
Filter 3 hit
Filter 4 hit
Filter 5 hit
Filter 6 hit
Filter 7 hit
2
0
0
0
0
1
BOHOLD
0
0
15-17