PCD5008 datasheet(26/64 Pages) PHILIPS

26 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.5.8

RECEIVER SHUT-DOWN SEQUENCE

The PCD5008 allows up to 3 steps associated with

shutting down the receiver. When the PCD5008 decides to

turn off the receiver, the first shut-down setting, if enabled,

is applied to the receiver control lines for the

corresponding shut-down time. At the end of the last used

shut-down time, the receiver off setting is applied to the

receiver control lines. If the first shut-down setting is not

enabled, the PCD5008 switches directly from the

receiver on to the receiver off setting.

Figure 15 shows the receiver shut-down sequence when

all shut-down settings are enabled. If the receiver is on or

being warmed up when the decoder is turned off (by

clearing the ON bit in the control packet), the PCD5008

immediately executes the receiver shut-down sequence.

If the PCD5008 is executing the shut-down sequence

when turned on (with the ON bit in the control packet set)

the PCD5008 completes the shut-down sequence before

starting the warm-up sequence.

8.5.8.1

Receiver shut-down setting packets

(ID = 1A to 1BH)

SE: step enable (Table 21). The receiver setting is

enabled when the bit is set. If the bit is cleared then that

step in the receiver shut-down sequence is disabled and

all following steps are ignored. Value after reset = 0.

LBC: low battery check (Table 21). If this bit is set, the

PCD5008 checks the status of the LOBAT port just before

leaving this receiver shut-down state. Value after

reset = 0.

CLS: control line setting (Table 21). This is the value to be

output on the receiver control lines (S0 to S7) for this

receiver shut-down state. Value after reset = 0.

ST: step time (Table 21). This sets the duration time for

receiver shut-down, until the next receiver state.

The setting is in steps of 625

µs. Valid values are

625

µs (ST = 01H) to 39.375 ms (ST = 3FH). Value after

reset = 01H.

s: setting number, see Tables 20 and 21 for the s names

and values and location in the receiver shut-down packet.

Table 20 s names and values

SETTING NAME

shut-down 1

shut-down 2

Table 21 Receiver shut-down stages

BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

30001101

2SE0

LBC

CLS7

CLS6

CLS5

CLS4

CLS3

CLS2

CLS1

CLS0

000

ST5

ST4

ST3

ST2

ST1

ST0

Fig.15 Receiver shut-down sequence.

handbook, full pagewidth

MGK267

receiver

control

line setting

shut down

time 1

shut down

setting 1

shut down

time 2

shut down

setting 2

possible

LOBAT

check

off

possible

LOBAT

check

possible

LOBAT

check

1600 sps or 3200 sps

sync or data setting

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