HC05 datasheet(72/232 Pages) MOTOROLA

72 / 232 page

MOTOROLA

5-10

MC68HC05X16

Rev. 1

MOTOROLA CAN MODULE (MCAN)

5.3.3

MCAN status register (CSTAT)

This is a read only register; only the MCAN can change its contents.

BS — Bus status

This bit is set (off-bus) by the MCAN when the transmit error counter reaches 256. The MCAN will

then set RR and will remain off-bus until the CPU clears RR again. At this point the MCAN will wait

for 128 successive occurrences of a sequence of 11 recessive bits before clearing BS and

resetting the read and write error counters. While off-bus the MCAN does not take part in bus

activities.

1 (set)

–

Off-bus – The MCAN is not participating in bus activities.

0 (clear) –

On-bus – The MCAN is operating normally.

ES — Error status

1 (set)

–

Error – Either the read or the write error counter has reached the

CPU warning limit of 96.

0 (clear) –

Neither of the error counters has reached 96.

TS — Transmit status

1 (set)

–

Transmit – The MCAN has started to transmit a message.

0 (clear) –

Idle – If the receive status bit is also clear then the MCAN is idle;

otherwise it is in receive mode.

RS — Receive status

1 (set)

–

Receive – The MCAN entered receive mode from idle, or by losing

arbitration during transmission.

0 (clear) –

Idle – If the transmit status bit is also clear then the MCAN is idle;

otherwise it is in transmit mode.

Address

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

Reset condition

State

on reset

MCAN status

(CSTAT)

$0022

TCS

TBA

RBS

External reset

0000 1100

RR bit set

uu00 1100

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