Freescale Semiconductor MPC5200B - Manual (Page 654)

Memory Map / Register Definition
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 19-15
19.5.12 MSCAN Transmitter Message Abort Ack (CANTAAK)—MBAR +0x0911 / 0x0991
Note: This register is held in the reset state when the initialization mode is active (INITRQ = 1 and INITAK = 1).
READ: Anytime
WRITE: Not writable at any time
.
19.5.13 MSCAN Transmit Buffer Selection (CANTBSEL)—MBAR + 0x0914 /0x0991
Note: This register is held in the reset state when the initialization mode is active (INITRQ = 1 and INITAK = 1). This register is
writable again as soon as the initialization mode is exited (INITRQ = 0 and INITAK = 0).
READ: Find the lowest ordered bit set to ‘1’, all other bits will be read as ‘0’
WRITE: Anytime when not in Initialization Mode
Table 19-15. MSCAN Transmitter Message Abort Acknowledgement Register
msb 0 1 2 3 4 5 6 7 lsb
R Reserved ABTAK[2:0]
W
RESET: 0 0 0 0 0 0 0 0
Bit Name Description
0:4 — Reserved
5:7 ABTAK[2:0] Abort Acknowledge—flag acknowledges a message was aborted due to a pending CPU
abort request. After a specific message buffer is flagged empty, application software can
use this flag to identify whether message was successfully aborted or was sent. Flag is
cleared whenever the corresponding TxE flag is cleared.
0 = message not aborted
1 = message aborted
Table 19-16. MSCAN Transmit Buffer Selection Register
msb 0 1 2 3 4 5 6 7 lsb
R Reserved TX[2:0]
W
RESET: 0 0 0 0 0 0 0 0
Bit Name Description
0:4 — Reserved
5:7 TX[2:0] Transmit Buffer Select—lowest numbered bit places respective Tx buffer in CANTxFG
register space (e.g., Tx1=1 and Tx0=1 selects Tx buffer Tx0, Tx1=1 and Tx0=0 selects Tx
buffer Tx1)
0 = associated message buffer deselected
1 = associated message buffer selected, if lowest numbered bit