CFR

The Function Register controls the features RAM_Initialisation and Power_Down also by application register. The CAN module can be prepared for Power_Down by setting the port CAN_CLKSTOP_REQ to one or writing to CFR.ClkStReq a one. The power down state is left by setting port CAN_CLKSTOP_REQ to zero or writing to CFR.ClkStReq a zero, acknowledged by CAN_CLKSTOP_ACK is going to zero as well as CFR.ClkStAck. The CCTRL.Init bit is left one and has to be written by the application to re-enable CAN transfers. Note: It's recommended to use either the ports CAN_CLKSTOP_REQ and CAN_CLKSTOP_ACK or the CCTRL.ClkStReq and CFR.ClkStAck. The application CFR.ClkStReq showsalso the actual status of the portCAN_CLKSTOP_REQ.
Module Instance Base Address Register Address
can0 0xFFC00000 0xFFC00018
can1 0xFFC01000 0xFFC01018

Offset: 0x18

Access: RW

Important: To prevent indeterminate system behavior, reserved areas of memory must not be accessed by software or hardware. Any area of the memory map that is not explicitly defined as a register space or accessible memory is considered reserved.
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Reserved
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Reserved

RAMinit

RW 0x0

Reserved

ClkStReq

RW 0x0

ClkStAck

RO 0x0

CFR Fields

Bit Name Description Access Reset
3 RAMinit

Request for automatic RAM Initialization

Value Description
0x0 No automatic RAM Initialization is requested, if once a ram initialization is started a write of a zero will be ignored. The Bit is cleared by hardware, after RAM Initialization is completed.
0x1 Start automatic RAM Initialization. All message objects will be written with zeros and the parity bits will be set. The RAMInit Bit will return to zero after the RAM-Initialization process is completed. A RAM Initialization Request is only possible if CCTRL.Init is set. The duration of the automatic RAM Initialization is messagebuffer-size + 4 host_clock cycles.
RW 0x0
1 ClkStReq

Clock Stop Request

 RW 0x0
0 ClkStAck

Clock Stop Acknowledgement

 RO 0x0