PCD5013H datasheet(22/76 Pages) PHILIPS

22 / 76 page

1999 Apr 12

Philips Semiconductors

Product speciﬁcation

FLEX

™ roaming decoder II

PCD5013

8.4.8

OPERATING THE 1-MINUTE TIMER

The PCD5013 provides a 1-minute timer which allows the

host to implement a time-of-day function while maintaining

low-power operation. The 1-minute timer is enabled using

the MTE bit in the configuration packet (Section 8.4.4).

When the 1-minute timer is enabled, a status packet is

sent at 1-minute intervals with the MT bit set

(Section 8.4.11). When the MTE bit is clear, the internal

1-minute timer stops counting. When the host sends a

control packet with MTC bit set, the 1-minute timer restarts

from 0. This allows accurate setting of a time-of-day

function.

8.4.9

ROAMING CONTROL PACKET (ID = 05H)

The roaming control packet controls the features of the

PCD5013 that allow implementation of a roaming pager.

IRS: ignore re-synchronization signal (Table 13). When

this bit is set, the PCD5013 does not go asynchronous

when detecting an Ar or Ar signal during searches for

A-words. It merely reports that the re-synchronization

signal was received by setting RSR to 1 in the Roaming

Status packet. This allows the host to decide what to do

when the paging device is synchronous to more than one

channel and only one channel is sending the

re-synchronization signal. It also prevents the PCD5013

from losing synchronization when it detects the

re-synchronization signal while the paging device is

checking an unknown channel. This bit is set and cleared

by the host. Value after reset = 0.

NBC: network bit check (Table 13). Setting this bit enables

reporting of the received network bit value (NBU and n) in

the Roaming Status Packet. Setting this bit also makes the

PCD5013 abandon a frame after the Frame Info word

without synchronizing to the frame if the frame information

word is uncorrectable or if the n bit in the frame information

word is not set. If the PCD5013 is in synchronous mode

when this occurs (probably due to synchronizing to a

second channel), it maintains synchronization to the

original channel.

If the PCD5013 is in asynchronous mode when this

occurs, it stays in asynchronous mode and end the A-word

search. This is done to avoid synchronizing to a

non-roaming channel when searching for roaming

channels. This bit is set and cleared by the host. Value

after reset = 0.

MCM: manual collapse mode (Table 13). When this bit is

set, the PCD5013 behaves as if the system collapse

was 7. The PCD5013 does not apply the received system

collapse to the AF bits. When this bit is set, the received

system collapse is reported to the host via SCU and RSC

in the Roaming Status Packet. This is so the host can

modify the AF bits based on the system collapse of the

channel. This bit is set and cleared by the host. Value after

reset = 0.

IS1: invert EXTS1 (Table 13). Setting this bit inverts the

expected polarity of the EXTS1 pin from the way it is

configured by SP 1 in the Configuration Packet (e.g. if both

IS1 and SP 1 are set, the polarity of the EXTS1 pin is

untouched). This bit is intended to be changed when a

change in a channel changes the polarity of the received

signal. This bit is set and cleared by the host. This bit has

the equivalent effect when using the internal demodulator.

Value after reset = 0.

SDF: stop decoding frame (Table 13). Setting this bit

causes the PCD5013 to stop decoding a frame without

losing frame synchronization. This bit is set by the host,

and cleared by the PCD5013 once it has been processed.

The packet with the SDF bit set must be sent after

receiving the status packet with EA bit set. It must be sent

within 40 ms of the end of block in which the PCD5013 set

the EA bit. Value after reset = 0.

RSP: receiver shutdown packet enable (Table 13). When

this bit is set, a Receiver Shutdown Packet is sent

whenever the receiver is shut down. The receiver

shutdown packet informs the host that the receiver

shutdown, and gives the time period before the PCD5013

automatically warms the receiver back up. Value after

reset = 0.

Table 13 Roaming Control Packet bit assignments

BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

300000101

IRS

NBC

MCM

IS1

SDF

RSP

SND

CND

RND

ABI

SAS

DAS

AF11

AF10

AF9

AF8

000

MFC1

MFC0

MCO1

MCO0

PCD5013H Datasheet(PDF) 22 Page - NXP Semiconductors

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