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Chapter 12 Freescale’s Scalable Controller Area Network (S12MSCANV3)
MC9S12ZVM Family Reference Manual Rev. 1.3
Freescale Semiconductor
437
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The transmission buffer with the lowest local priority field wins the prioritization.
In cases of more than one buffer having the same lowest priority, the message buffer with the lower index
number wins.
12.3.3.5
Time Stamp Register (TSRH–TSRL)
If the TIME bit is enabled, the MSCAN will write a time stamp to the respective registers in the active
transmit or receive buffer right after the EOF of a valid message on the CAN bus (see
“MSCAN Control Register 0 (CANCTL0)
”). In case of a transmission, the CPU can only read the time
stamp after the respective transmit buffer has been flagged empty.
The timer value, which is used for stamping, is taken from a free running internal CAN bit clock. A timer
overrun is not indicated by the MSCAN. The timer is reset (all bits set to 0) during initialization mode. The
CPU can only read the time stamp registers.
Module Base + 0x00XD
Access: User read/write
(1)
1. Read: Anytime when TXEx flag is set (see
Section 12.3.2.7, “MSCAN Transmitter Flag Register (CANTFLG)
corresponding transmit buffer is selected in CANTBSEL (see
Section 12.3.2.11, “MSCAN Transmit Buffer Selection Register
Write: Anytime when TXEx flag is set (see
Section 12.3.2.7, “MSCAN Transmitter Flag Register (CANTFLG)
corresponding transmit buffer is selected in CANTBSEL (see
Section 12.3.2.11, “MSCAN Transmit Buffer Selection Register
7
6
5
4
3
2
1
0
R
PRIO7
PRIO6
PRIO5
PRIO4
PRIO3
PRIO2
PRIO1
PRIO0
W
Reset:
0
0
0
0
0
0
0
0
Figure 12-36. Transmit Buffer Priority Register (TBPR)
Module Base + 0x00XE
Access: User read/write
(1)
1. Read: For transmit buffers: Anytime when TXEx flag is set (see
Section 12.3.2.7, “MSCAN Transmitter Flag Register
”) and the corresponding transmit buffer is selected in CANTBSEL (see
Section 12.3.2.11, “MSCAN Transmit
Buffer Selection Register (CANTBSEL)
”). For receive buffers: Anytime when RXF is set.
Write: Unimplemented
7
6
5
4
3
2
1
0
R
TSR15
TSR14
TSR13
TSR12
TSR11
TSR10
TSR9
TSR8
W
Reset:
x
x
x
x
x
x
x
x
Figure 12-37. Time Stamp Register — High Byte (TSRH)
Содержание MC9S12ZVM series
Страница 116: ...Chapter 2 Port Integration Module S12ZVMPIMV1 MC9S12ZVM Family Reference Manual Rev 1 3 116 Freescale Semiconductor ...
Страница 242: ...Chapter 7 ECC Generation Module SRAM_ECCV1 MC9S12ZVM Family Reference Manual Rev 1 3 242 Freescale Semiconductor ...
Страница 384: ...Chapter 10 Supply Voltage Sensor BATSV3 MC9S12ZVM Family Reference Manual Rev 1 3 384 Freescale Semiconductor ...
Страница 484: ...Chapter 13 Programmable Trigger Unit PTUV2 MC9S12ZVM Family Reference Manual Rev 1 3 484 Freescale Semiconductor ...
Страница 662: ...Chapter 17 Gate Drive Unit GDUV4 MC9S12ZVM Family Reference Manual Rev 1 3 662 Freescale Semiconductor ...
Страница 684: ...Chapter 18 LIN Physical Layer S12LINPHYV2 MC9S12ZVM Family Reference Manual Rev 1 3 684 Freescale Semiconductor ...
Страница 740: ...Chapter 19 128 KB Flash Module S12ZFTMRZ128K512V2 MC9S12ZVM Family Reference Manual Rev 1 3 740 Freescale Semiconductor ...
Страница 756: ...Appendix A MCU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 756 Freescale Semiconductor ...
Страница 772: ...Appendix D LINPHY Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 772 Freescale Semiconductor ...
Страница 776: ...Appendix E GDU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 776 Freescale Semiconductor ...
Страница 788: ...Appendix I MSCAN Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 788 Freescale Semiconductor ...
Страница 790: ...Appendix J Package Information MC9S12ZVM Family Reference Manual Rev 1 3 790 Freescale Semiconductor ...