PC912XDP512F0MPVR datasheet(433/1348 Pages) FREESCALE

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Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

433

10.3.2.7

MSCAN Transmitter Flag Register (CANTFLG)

The transmit buffer empty ﬂags each have an associated interrupt enable bit in the CANTIER register.

Table 10-10. CANRIER Register Field Descriptions

Field

Description

WUPIE1

1 WUPIE and WUPE (see Section 10.3.2.1, “MSCAN Control Register 0 (CANCTL0)”) must both be enabled if the recovery

mechanism from stop or wait is required.

Wake-Up Interrupt Enable

No interrupt request is generated from this event.

A wake-up event causes a Wake-Up interrupt request.

CSCIE

CAN Status Change Interrupt Enable

No interrupt request is generated from this event.

A CAN Status Change event causes an error interrupt request.

5:4

RSTATE[1:0]

Receiver Status Change Enable — These RSTAT enable bits control the sensitivity level in which receiver state

changes are causing CSCIF interrupts. Independent of the chosen sensitivity level the RSTAT ﬂags continue to

indicate the actual receiver state and are only updated if no CSCIF interrupt is pending.

00 Do not generate any CSCIF interrupt caused by receiver state changes.

01 Generate CSCIF interrupt only if the receiver enters or leaves “bus-off” state. Discard other receiver state

changes for generating CSCIF interrupt.

10 Generate CSCIF interrupt only if the receiver enters or leaves “RxErr” or “bus-off”2 state. Discard other

receiver state changes for generating CSCIF interrupt.

11 Generate CSCIF interrupt on all state changes.

2 Bus-off state is deﬁned by the CAN standard (see Bosch CAN 2.0A/B protocol speciﬁcation: for only transmitters. Because the

only possible state change for the transmitter from bus-off to TxOK also forces the receiver to skip its current state to RxOK,

the coding of the RXSTAT[1:0] ﬂags deﬁne an additional bus-off state for the receiver (see Section 10.3.2.5, “MSCAN Receiver

Flag Register (CANRFLG)”).

3:2

TSTATE[1:0]

Transmitter Status Change Enable — These TSTAT enable bits control the sensitivity level in which transmitter

state changes are causing CSCIF interrupts. Independent of the chosen sensitivity level, the TSTAT ﬂags

continue to indicate the actual transmitter state and are only updated if no CSCIF interrupt is pending.

00 Do not generate any CSCIF interrupt caused by transmitter state changes.

01 Generate CSCIF interrupt only if the transmitter enters or leaves “bus-off” state. Discard other transmitter

state changes for generating CSCIF interrupt.

10 Generate CSCIF interrupt only if the transmitter enters or leaves “TxErr” or “bus-off” state. Discard other

transmitter state changes for generating CSCIF interrupt.

11 Generate CSCIF interrupt on all state changes.

OVRIE

Overrun Interrupt Enable

No interrupt request is generated from this event.

An overrun event causes an error interrupt request.

RXFIE

Receiver Full Interrupt Enable

No interrupt request is generated from this event.

A receive buffer full (successful message reception) event causes a receiver interrupt request.

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