Section 19 Controller Area Network (RCAN-TL1)
Rev. 0.50 May 18, 2006 Page 916 of 1588
REJ09B0313-0050
Bit 2 — Message Transmission in progress Flag (GSR2):
Flag that indicates to the CPU if the
RCAN-TL1 is in Bus Off or transmitting a message or an error/overload flag due to error detected
during transmission. The timing to set TXACK is different from the time to clear GSR2. TXACK
is set at the 7
th
bit of End Of Frame. GSR2 is set at the 3
rd
bit of intermission if there are no more
messages ready to be transmitted. It is also set by arbitration lost, bus idle, reception, reset or halt
transition.
Bit 2: GSR2
Description
0
RCAN-TL1 is in Bus Off or a transmission is in progress
1
[Setting condition]
Not in Bus Off and no transmission in progress (Initial value)
Bit 1—Transmit/Receive Warning Flag (GSR1):
Flag that indicates an error warning.
Bit 1: GSR1
Description
0
[Reset condition] When (TEC < 96 and REC < 96) or Bus Off (Initial value)
1
[Setting condition] When 96
≤
TEC
<
256 or 96
≤
REC
<
256
Note: REC is incremented during Bus Off to count the recurrences of 11 recessive bits as
requested by the Bus Off recovery sequence. However the flag GSR1 is not set in Bus Off.
Bit 0—Bus Off Flag (GSR0):
Flag that indicates that RCAN-TL1 is in the bus off state.
Bit 0: GSR0
Description
0 [Reset
condition]
Recovery from bus off state or after a HW or SW reset (Initial value)
1
[Setting condition] When TEC
≥
256 (bus off state)
Note: Only the lower 8 bits of TEC are accessible from the user interface. The 9
th
bit is equivalent
to GSR0.
Содержание Single-Chip Microcomputer SH7203
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Страница 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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