MAC7200 datasheet(588/976 Pages) FREESCALE

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The Generic FlexCAN2 Module

MAC7200 Microcontroller Family Reference Manual, Rev. 2

510

Freescale Semiconductor

The address space occupied by FlexCAN has 96 bytes for registers starting at the module base address,

followed by MB storage space in embedded RAM starting at address $0060, and an extra ID Mask storage

space in a separate embedded RAM starting at address $0880.

28.2.6.1

Memory Map

The complete memory map for a FlexCAN module with 64 MBs capability is shown in Table 28-4. Each

individual register is identified by its complete name and the corresponding mnemonic. The access type

can be Supervisor (S) or Unrestricted (U). Most of the registers can be configured to have either Supervisor

or Unrestricted access by programming the SUPV bit in the MCR Register. These registers are identified

as S/U in the Access column of Table 28-4.

The IFLAG2 and IMASK2 registers are considered reserved space when FlexCAN is configured with 16

or 32 MBs. The Rx Global Mask (RXGMASK), Rx Buffer 14 Mask (RX14MASK) and the Rx Buffer 15

Mask (RX15MASK) registers are provided for backwards compatibility, and are not used when the BCC

bit in MCR is asserted.

The address ranges $0060–$047F and $0880–$097F are occupied by two separate embedded memories.

These two ranges are completely occupied by RAM (1056 and 256 bytes, respectively) only when

FlexCAN is configured with 64 MBs. When it is configured with 16 MBs, the memory sizes are 288 and

64 bytes, so the address ranges $0180–$047F and $08C0–$097F are considered reserved space. When it

is configured with 32 MBs, the memory sizes are 544 and 128 bytes, so the address ranges $0280–$047F

and $0900–$097F are considered reserved space. Furthermore, if the BCC bit in MCR is negated, then the

whole Rx Individual Mask Registers address range ($0880–$097F) is considered reserved space.

NOTE

The individual Rx Mask per Message Buffer feature may not be available in

low cost MCUs. Please consult the specific MCU documentation to find out

if this feature is supported. If not supported, the address range $0880-$097F

is considered reserved space, independent of the value of the BCC bit.

Table 28-4. Module Memory Map

Address

Use

Access

Type

Affected

by Hard

Reset

Affected

by Soft

Reset

Base + $0000

Module Configuration (MCR)

Yes

Base + $0004

Control Register (CTRL)

S/U

Yes

Base + $0008

Free Running Timer (TIMER)

S/U

Yes

Base + $000C

Reserved

Base + $0010

Rx Global Mask (RXGMASK)

S/U

Yes

Base + $0014

Rx Buffer 14 Mask (RX14MASK)

S/U

Yes

Base + $0018

Rx Buffer 15 Mask (RX15MASK)

S/U

Yes

Base + $001C

Error Counter Register (ECR)

S/U

Yes

Base + $0020

Error and Status Register (ESR)

S/U

Yes

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