Download UM10316

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UM10316
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Chapter 21: LPC29xx CAN 0/1
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NXP Semiconductors
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The start address of the group of the standard frame-format section is defined in the
CASFGSA register with a value of 10h. The end of this section is defined in the CAEFESA
register.
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12.2 Group of standard frame-format identifier section (11-bit CAN ID)
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In the explicit extended frame-format section, only one CAN Identifier with its SCC is
programmed per address line.
To provide memory space for four explicit extended frame-format identifiers the
CAEFGSA register value is set to 30h.
12.4 Group of extended frame-format identifier section (29-bit CAN ID)
The start address of the extended frame-format group is defined by the CAEFGSA
register with a value of 30h. The end of this section is defined by the end-of-table address
register CAEOTA.
In the extended frame-format section group boundaries are programmed with a pair of
address lines. The first is the lower boundary, the second the upper boundary.
To provide memory space for two groups of extended frame-format Identifiers the
CAEOTA register value is set to 40h.
UM10316_0
User manual
© NXP B.V. 2008. All rights reserved.
Rev. 00.06 — 17 December 2008
357 of 571
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The start address of the explicit extended frame-format section is defined in the
CAEFESA register with a value of 20h. The end of this section is defined in the CAEFGSA
register.
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12.3 Explicit standard frame-format identifier section (29-bit CAN ID)
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To provide memory space for four Groups of standard frame-format identifiers the
CAEFESA register value is set to 20h. The identifier group with Index 9 of this section is
not used and is therefore disabled.
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In the group of standard frame-format sections, two CAN Identifiers with the same SCC
share one 32-bit word and represent a range of CAN Identifiers to be accepted. Bits 31
down to 16 represent the lower boundary and bits 15 down to 0 represent the upper
boundary of the range of CAN Identifiers. All identifiers within this range (including the
boundary identifiers) are accepted. A whole group can be disabled and not used by the
acceptance filter by setting the message-disable bit in the upper and lower boundary
identifiers.