HC05 datasheet(75/232 Pages) MOTOROLA

75 / 232 page

MC68HC05X16

Rev. 1

MOTOROLA

5-13

MOTOROLA CAN MODULE (MCAN)

RIF — Receive interrupt ﬂag

The RIF bit is set by the MCAN when a new message is available in the receive buffer, and the RIE

bit in CCNTRL is set. At the same time RBS is set. Like all the bits in this register, RIF is cleared

by reading the register, or when reset request is set.

1 (set)

–

A new message is available in the receive buffer.

0 (clear) –

No receive interrupt has occurred.

5.3.5

MCAN acceptance code register (CACC)

On reception each message is written into the current receive buffer. The MCU is only signalled to

read the message however, if it passes the criteria in the acceptance code and acceptance mask

registers (accepted); otherwise, the message will be overwritten by the next message (dropped).

Note:

This register can only be accessed when the reset request bit in the CCNTRL register

is set.

AC7 – AC0 — Acceptance code bits

AC7 – AC0 comprise a user deﬁned sequence of bits with which the 8 most signiﬁcant bits of the

data identiﬁer (ID10 – ID3) are compared. The result of this comparison is then masked with the

acceptance mask register. Once a message has passed the acceptance criterion the respective

identiﬁer, data length code and data are sequentially stored in a receive buffer, providing there is

one free. If there is no free buffer, the data overrun condition will be signalled.

On acceptance the receive buffer status bit is set to full and the receive interrupt bit is set (provided

RIE = enabled).

Address

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

State

on reset

MCAN acceptance code (CACC)

$0024

AC7

AC6

AC5

AC4

AC3

AC2

AC1

AC0

Undeﬁned

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