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| 型號： | MSM9225BGA-2K |
| 廠商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 47/95頁 |
| 文件大?。?/td> | 567K |
| 代理商： | MSM9225BGA-2K |
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MSM9225B User’s Manual
Chapter 2 Register Descriptions
2 – 38
2.4.12 CAN Status Register (CANS: 9Fhex)
This is a register to indicate the error status of the MSM9225B.
Bit 6 to bit 4 are flags for the transmitter and bit 1 and bit 0 are for the receiver, and this register is read-only.
The bit configuration is shown below.
MSB
Not
used
BOFF
TEP
TEW
Not
used
Not
used
REP
REW
LSB
CANS (9Fhex), R/W: R
Initial
value:
00
0
Receive error counter (REC)
< 96
1REC
≥ 96, receive error warning state
0REC
< 128
1REC
≥ 128, receive error passive state
Unused bit.
0
Transmit error counter (TEC)
< 96
1TEC
≥ 96, transmit error warning state
0TEC
< 128
1TEC
≥ 128, transmit error passive state
0TEC
< 256
1TEC
≥ 256, bus off state
Unused bit.
Figure 2-36 CAN Status Register (CANS)
(1) Receive Error Warning: REW
When the Receive Error Counter (REC)
≥ 96, REW becomes “1”. If REW = “1”, it is probable that the bus
has been damaged. Testing the bus for this condition is recommended.
At reset or when REC < 96, REW becomes “0”.
(2) Receive Error Passive: REP
When the Receive Error Counter (REC)
≥ 128, REP becomes “1” (error passive).
At reset or when REC < 128, REP becomes “0” (error active).
(3) Transmit Error Warning: TEW
When the Transmit Error Counter (TEC)
≥ 96, TEW becomes “1”.
If TEW = “1”, it is probable that the bus has been damaged. Testing the bus for this condition is
recommended.
At reset or when TEC < 96, TEW becomes “0”.
(4) Transmit Error Passive: TEP
When the Transmit Error Counter (TEC)
≥ 128, TEP becomes “1” (error passive).
At reset or when TEC < 128, TEP becomes “0” (error active).
(5) Bus Off: BOFF
This flag indicates the CAN bus status.
When the Transmit Error Counter (TEC)
≥ 256, BOFF becomes “1” and the CAN bus is in the bus off
state.
At reset or when TEC < 256, BOFF becomes “0”.
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