MC68HC12 Datasheet, PDF(357/478 Page) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

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MC68HC12 Datasheet, PDF (357/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

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MSCAN Controller

Programmerâs Model of Control Registers

TWRNIF â Transmitter Warning Interrupt Flag

This bit will be set when the msCAN12 goes into warning status due

to the Transmit Error counter (TEC) exceeding 96 and neither one of

the Error interrupt flags or the Bus-Off interrupt flag is set(1). If not

masked, an Error interrupt is pending while this flag is set.

0 = No transmitter warning status has been reached.

1 = msCAN12 went into transmitter warning status.

RERRIF â Receiver Error Passive Interrupt Flag

This bit will be set when the msCAN12 goes into error passive status

due to the Receive Error counter (REC) exceeding 127 and the Bus-

Off interrupt flag is not set(2). If not masked, an Error interrupt is

pending while this flag is set.

0 = No receiver error passive status has been reached.

1 = msCAN12 went into receiver error passive status.

TERRIF â Transmitter Error Passive Interrupt Flag

This bit will be set when the msCAN12 goes into error passive status

due to the Transmit Error counter (TEC) exceeding 127 and the Bus-

Off interrupt flag is not set(3). If not masked, an Error interrupt is

pending while this flag is set.

0 = No transmitter error passive status has been reached.

1 = msCAN12 went into transmitter error passive status.

BOFFIF â BUSOFF Interrupt Flag

This bit will be set when the msCAN12 goes into BUSOFF status, due

to the Transmit Error counter exceeding 255. It cannot be cleared

before the msCAN12 has monitored 128*11 consecutive recessive

bits on the bus. If not masked, an Error interrupt is pending while this

flag is set.

0 = No BUSOFF status has been reached.

1 = msCAN12 went into BUSOFF status.

1. TWRNIF = (96 < TEC) & RERRIF& TERRIF & BOFFIF

2. RERRIF = (128 < REC < 255) & BOFFIF

3. TERRIF = (128 < TEC < 255) & BOFFIF

MC68HC912DT128A â Rev 4.0

MOTOROLA

MSCAN Controller

Technical Data

357

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