Freescale Semiconductor MPC5200B User Manual
Page 653
MPC5200B Users Guide, Rev. 1
19-14
Freescale Semiconductor
Memory Map / Register Definition
19.5.10
MSCAN Transmitter Interrupt Enable Register (CANTIER)—MBAR+0x090D /
0x098D
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: Anytime
Write: Anytime when not in Initialization Mode.
19.5.11
MSCAN Transmitter Message Abort Request (CANTARQ)—MBAR + 0x0910 /
0x0990
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: Anytime
Write: Anytime when not in Initialization Mode; write of “1” clears flag, write of ‘0’ is ignored.
Note: Software must not clear one or more bits of TXE Flag and simultaneously set the respective ABTRQ bit(s).
Table 19-13. MSCAN Transmitter Interrupt Enable Register
msb 0
1
2
3
4
5
6
7 lsb
R
Reserved
TXEIE[2:0]
W
RESET:
0
0
0
0
0
0
0
0
Bit
Name
Description
0:4
—
Reserved
5:7
TXEIE[2:0]
Transmitter Empty Interrupt Enable
0 = No interrupt request is generated from this event.
1 = Transmitter empty (Tx buffer available) event causes Tx empty interrupt request.
Table 19-14. MSCAN Transmitter Message Abort Request Register
msb 0
1
2
3
4
5
6
7 lsb
R
Reserved
ABTRQ[2:0]
W
RESET:
0
0
0
0
0
0
0
0
Bit
Name
Description
0:4
—
Reserved
5:7
ABTRQ[2:0]
Abort Request—CPU sets bit to request a scheduled message buffer (TxEx=0) be
aborted. MSCAN grants request if message has not already started transmission, or if
transmission is not successful (lost arbitration or error). When message is aborted, the
associated TxE and abort acknowledge flags (ABTAK) are set and a Tx interrupt occurs if
enabled. The CPU cannot reset ABTRQx. ABTRQx is reset whenever the associated TxE
flag is set.
0 = No abort request
1 = Abort request pending