MC68HC912BD32 Datasheet, PDF (217/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Byteflight™ Module
Programmer’s Model
FIFO Identifier
Rejection Register
(FIDRJ)
The FIFO identifier rejection register defines a user specified sequence
of bits with which the incoming identifier is compared. This determines
whether the message is rejected by the FIFO. Only a hard reset will clear
the register.
FIDRJ
R
$xx14
W
HARDRESET
BIT 7
FIDRJ7*
0
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
FIDRJ6* FIDRJ5* FIDRJ4* FIDRJ3* FIDRJ2*
0
0
0
0
0
Figure 50 FIFO Identifier Rejection Register
BIT 1
FIDRJ1*
0
BIT 0
FIDRJ0*
0
NOTE: The FIDRJ register can only be written if the SFTRES bit in the Module
Configuration register is set.
FIFO Identifier
Rejection Mask
Register (FIDRMR)
The identifier rejection mask register specifies which of the
corresponding bits in the identifier rejection register are relevant for
rejection filtering. A cleared bit in this register indicates that the
corresponding bit in the identifier rejection register must be the same as
the incoming identifier bit, before a match will be detected. The message
will be rejected by the FIFO if all such bits match. If a bit is set, it indicates
that the state of the corresponding bit in the identifier rejection register
will not affect whether or not the message is rejected by the FIFO. Only
a hard reset will set the register.
Bit description:
1 = Ignore corresponding rejection register bit
0 = Match corresponding rejection register bit
BIT 7
FIDRMR
$xx15
R
FIDRMR7*
W
HARDRESET
1
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
FIDRMR6* FIDRMR5* FIDRMR4* FIDRMR3* FIDRMR2*
1
1
1
1
1
Table 50 FIFO Rejection Mask Register
BIT 1
FIDRMR1*
1
BIT 0
FIDRMR0*
1
NOTE: The FIDRMR register can only be written if the SFTRES bit in the Module
Configuration register is set.
47-sibus
Byteflight™ Module
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MC68HC912BD32 Rev 1.0