PCD5013H/F1 데이터 시트보기 (PDF) - Philips Electronics

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PCD5013H/F1

FLEX™roaming decoder II

Philips Electronics 

Philips Semiconductors

FLEX™ roaming decoder II

Product specification

PCD5013

SMU: synchronous mode update (Table 16). This bit is set

if the SM bit has been updated in this packet. After the

PCD5013 has been turned on, this bit is set when the first

synchronization words are found (SM changes to 1) or

when the first synchronization search period (meaning the

receiver is active during this time) expires (SM stays 0),

after the PCD5013 is turned on. The latter condition gives

the host the option of assuming the paging device is in

range when it is turned on, and displaying out-of-range

only after the initial search period expires. After the initial

synchronous mode update, the SMU bit is set whenever

the PCD5013 switches from/to synchronous mode. The bit

is cleared when read. Changes in the SM bit due to turning

off the PCD5013 does not set the SMU bit. This bit is

initialized to 0 when the PCD5013 is reset.

LB: low battery (Table 16). Set to the value last read from

the LOBAT pin. The host controls when the LOBAT pin is

read via the receiver control packets. This bit is initialized

to 0 at reset. It is also initialized to the inverse of the

LBP bit in the configuration packet, when the PCD5013 is

turned on, by setting the ON bit in the control packet.

LBU: low battery update (Table 16). This bit is set if the

value on two consecutive reads of the LOBAT pin yielded

different results. The bit is cleared when read. The host

controls when the LOBAT pin is read via the receiver

control packets. Changes in the LB bit due to turning on

the PCD5013 do not cause the LBU bit to be set. This bit

is initialized to 0 when the PCD5013 is reset.

EOF: end of frame (Table 16). Set when the PCD5013 is

in all frame mode (AFM) (Section 8.8.4), and the end of

the frame has been reached. The PCD5013 is in the AFM

if the AFM enable counter is non-zero, if any temporary

address enabled (TAE) counter is non-zero (Section 8.8.4)

or if the FAF bit in the AFM packet is set. The bit is cleared

when read and initialized to 0 when the PCD5013 is reset.

MT: minute time-out (Table 16). Set if one minute has

elapsed. The bit is cleared when read. This bit is initialized

to 0 when the PCD5013 is reset.

BOE: buffer overflow error (Table 16). Set when

information has been lost owing to slow host response

time. When the PCD5013 detects that its SPI transmit

buffer has overflowed, it clears the transmit buffer, turns off

decoding by clearing the ON bit in the control packet, and

sets this bit. The bit is cleared when read. This bit is

initialized to 0 when the PCD5013 is reset.

EA: end of addresses (Table 16). If EAE of the control

packet is set and an address is detected in a frame, EA is

set after the PCD5013 processes the last address in the

frame. Since data packets take priority over the status

packet, the status packet with the EA bit set is guaranteed

to come after all address packets for the frame. Cleared

when read. This bit is initialized to 0 when the PCD5013 is

reset.

x: unused bits (Table 16). The value of these bits is not

guaranteed.

8.4.12 RECEIVER SHUTDOWN PACKET (ID = 7EH)

The Receiver Shutdown Packet is sent in both

synchronous and asynchronous mode. It is designed to

indicate to the host that the receiver is turned off and how

much time there is until the PCD5013 automatically turns

it back on. This enables the host to perform other tasks

such as monitoring other pager channels.

FNV: frame number valid (Table 17). This bit is set if the

last decoded frame information word was correctable and

the frame number was the expected value. When in

asynchronous mode, this value is 0.

CF: current frame (Table 17). When in synchronous mode,

this is the current frame number. This value is latched on

the negative edge of the READY line when this packet is

sent to the host. The value of this field is valid only if the

PCD5013 is in synchronous mode and the FIV bit in the

status packet is set. When in asynchronous mode, this

value is 0.

TNF: time to next frame (Table 17). When in synchronous

mode TNF indicates the time to the start of the A-word

check if the PCD5013 were to warm-up for the next frame.

When in asynchronous mode TNF indicates the time to the

start of the next automatic noise detect. See section 8.8.9

for an explanation on how to use this value. This value is

latched on the negative edge of the READY line when this

packet is sent to the host.

FCO: frame carried on (Table 17). Set if the PCD5013 is

decoding the next frame due to the reception of a non-zero

carry-on value in the current or a previous frame. When in

asynchronous mode, this value is 0.

NAF: next assigned frame (Table 17). This is the frame

number of the next frame the PCD5013 was scheduled to

decode when the receiver shut down. The value of this

field is valid only if the PCD5013 is in synchronous mode

and the FIV bit in the status packet is set. When in

asynchronous mode this value is 0.

1999 Apr 12

25

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