PCD5008 datasheet(16/64 Pages) PHILIPS

16 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.4.3

CONFIGURATION SEQUENCE

A typical configuration and synchronisation sequence

would be as follows, see Fig.11 for event timings:

1. The PCD5008 is reset by the host.

2. After 1 second the PCD5008 interrupts the host to

read the part ID by pulling the READY line LOW.

3. The host pulls SS LOW at the start of each

SPI transfer and clocks out the part ID data.

4. The host configures the following aspects of PCD5008

operation:

a) General configuration (Section 8.4.4)

b) Receiver operation (Section 8.5)

c) FLEX

™ CAPCODE configuration (Section 8.6).

The PCD5008 writes a part ID packet in response to

each incoming packet.

5. At the end of each packet the PCD5008 pulls the

READY line HIGH, and then LOW again to indicate

that packet processing is complete.

6. The host writes a control packet to enable FLEX

™

decoding in the PCD5008 (Section 8.4.7).

7. The host writes a checksum packet to enable SPI data

output by the PCD5008 (Section 8.4.2).

8. On recognising a SYNC word, the PCD5008

synchronises to the channel.

9. The PCD5008 initiates an SPI transfer writing the

status packet, indicating that it is now in synchronous

mode.

Fig.11 Typical configuration and synchronisation sequence.

handbook, full pagewidth

MBK097

SPI

DECODER-TO-HOST

RESET

READY

FLEX DATASTREAM

SPI

HOST-TO-DECODER

checksum packet (7)

control packet (6)

partid packet (4)

configuration packets

(addresses, receiver etc.)

status packet (9)

partid packet (4)

(1)

(2)

(3)

(5)

(8)

SYNC

Numbers within parenthesis refer to sequence numbers, see Section 8.4.3.

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