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AT89C51CC02CA-RATUM 数据表(PDF) 95 Page - ATMEL Corporation |
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AT89C51CC02CA-RATUM 数据表(HTML) 95 Page - ATMEL Corporation |
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95 / 156 page  95 AT/T89C51CC02 4126J–CAN–05/06 Table 57. CANGSTA Register CANGSTA (S:AAh Read Only) CAN General Status Register Reset Value = x0x0 0000b 76 54 32 1 0 - OVFG - TBSY RBSY ENFG BOFF ERRP Bit Number Bit Mnemonic Description 7- Reserved The values read from this bit is indeterminate. Do not set this bit. 6OVFG Overload frame flag This status bit is set by the hardware as long as the produced overload frame is sent. This flag does not generate an interrupt 5- Reserved The values read from this bit is indeterminate. Do not set this bit. 4 TBSY Transmitter busy This status bit is set by the hardware as long as the CAN transmitter generates a frame (remote, data, overload or error frame) or an ack field. This bit is also active during an InterFrame Spacing if a frame must be sent. This flag does not generate an interrupt. 3RBSY Receiver busy This status bit is set by the hardware as long as the CAN receiver acquires or monitors a frame. This flag does not generate an interrupt. 2ENFG Enable on-chip CAN controller flag Because an enable/disable command is not effective immediately, this status bit gives the true state of a chosen mode. This flag does not generate an interrupt. 1BOFF Bus off mode See Figure 42 0 ERRP Error passive mode See Figure 42 |
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