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MC9S08DZ60MLH Datasheet, PDF (234/416 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 12 Freescaleâs Controller Area Network (S08MSCANV1)
NOTE
The CANTIER register is held in the reset state when the initialization mode
is active (INITRQ = 1 and INITAK = 1). This register is writable when not
in initialization mode (INITRQ = 0 and INITAK = 0).
Read: Anytime
Write: Anytime when not in initialization mode
Table 12-12. CANTIER Register Field Descriptions
Field
Description
2:0
TXEIE[2:0]
Transmitter Empty Interrupt Enable
0 No interrupt request is generated from this event.
1 A transmitter empty (transmit buffer available for transmission) event causes a transmitter empty interrupt
request. See Section 12.5.2.2, âTransmit Structuresâ for details.
12.3.8 MSCAN Transmitter Message Abort Request Register (CANTARQ)
The CANTARQ register allows abort request of messages queued for transmission.
7
6
5
4
3
2
1
R
0
0
0
0
0
ABTRQ2 ABTRQ1
W
Reset:
0
0
0
0
0
0
0
= Unimplemented
Figure 12-12. MSCAN Transmitter Message Abort Request Register (CANTARQ)
NOTE
The CANTARQ register is held in the reset state when the initialization
mode is active (INITRQ = 1 and INITAK = 1). This register is writable when
not in initialization mode (INITRQ = 0 and INITAK = 0).
Read: Anytime
Write: Anytime when not in initialization mode
0
ABTRQ0
0
Table 12-13. CANTARQ Register Field Descriptions
Field
Description
2:0
Abort Request â The CPU sets the ABTRQx bit to request that a scheduled message buffer (TXEx = 0) be
ABTRQ[2:0] aborted. The MSCAN grants the request if the message has not already started transmission, or if the
transmission is not successful (lost arbitration or error). When a message is aborted, the associated TXE (see
Section 12.3.6, âMSCAN Transmitter Flag Register (CANTFLG)â) and abort acknowledge ï¬ags (ABTAK, see
Section 12.3.9, âMSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)â) are set and a transmit
interrupt occurs if enabled. The CPU cannot reset ABTRQx. ABTRQx is reset whenever the associated TXE ï¬ag
is set.
0 No abort request
1 Abort request pending
MC9S08DZ60 Series Data Sheet, Rev. 4
234
Freescale Semiconductor
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