P82C150AHT datasheet(15/36 Pages) PHILIPS

15 / 36 page

1996 Jun 19

Philips Semiconductors

Preliminary speciﬁcation

CAN Serial Linked I/O device (SLIO) with

digital and analog port functions

P82C150

7.3.2

TRANSMISSION OF DATA FRAMES

Data Frames transmitted by the P82C150 contain three

data bytes (see Fig.7). The first data byte contains the

status information and the register address A3 to A0 (see

Tables 8 and 9), the other two data bytes contain the

content of the addressed I/O Register.

After each successful message transmission, the

P82C150 delays the transmission of a possibly further

pending message for three bit times. The reason is to give

other CAN controllers - with a lower identifier priority - the

possibility to transmit a message in case of faulty contact

at one of the edge-triggered port pins.

7.3.3

RECEPTION OF DATA FRAMES AND REMOTE

FRAMES

Received Data Frames have the same format as

transmitted ones, only the DIR-bit (ID.0) in the Arbitration

Field is different. The status bits RSTD, EW, BM1 and BM0

are ignored during reception.

The P82C150 confirms each reception of a Data Frame by

transmitting a Data Frame containing the (new) contents of

the addressed I/O Register.

7.3.3.1

Exceptions to the rule

1. Analog Configuration Register: If a P82C150 receives

a Data Frame addressing the Analog Configuration

respond with two messages. The first message returns

the contents of the Analog Configuration Register. The

control instructions are executed (e.g. next analog

input channel selected), and an analog-to-digital

conversion cycle is started after a set-up time. After

finishing the analog-to-digital conversion cycle, the

second message is transmitted containing the result

(ADC Register).

2. ADC Register: On receiving a Data Frame addressing

the ADC Register, the P82C150 starts an

analog-to-digital conversion cycle. It automatically

returns the result of the conversion (ADC Register) by

transmitting a respective Data Frame after finishing

the analog-to-digital conversion cycle.

3. At normal operation, the calibration messages are

confirmed by returning a dominant bit in the

acknowledge slot. There is no particular confirmation

message returned by the P82C150. Only after

entering the calibrated state (start-up), a Data Frame

(‘sign-on’ message) containing the Data Input Register

contents is transmitted indicating to the host node, that

the P82C150 is now ready for transmission.

7.3.3.2

Remote Frame

Received Remote Frames must have the Data Length

Code DLC = 3 (Remote Frames with DLC

≠ 3 are ignored).

It is answered by a Data Frame containing the contents of

the Data Input Register.

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