HT9580 datasheet(37/63 Pages) HOLTEK

37 / 63 page

HT9580

April 28, 2000

Preliminary

Symbol

Bit

R/W

Description

STB

Standby indication bit

When the value of the ON bit is 1, the system goes into the

STANDBY state. The STANDBY state allows the mC to execute

the configuration RAM setting.

Out-of-range indication bit

Whenever the decoder detects an out-of-range hold time, that is

selected by the configuration registers SPF06 and SPF07. The

out-of-range indication may be tested for an out-of-range condi-

tion whenever the interface enable of the decoder is active; other-

wise OR is normally low. The out-of-range indication is set high by

detection of valid data transmission.

If the out-of-range indication bit changes the status from high to

low or low to high, an interrupt will be generated and the

out-of-range hold-off time-out counter starts to count.

The bit is not valid when the SPI circuit is enabled.

R/W

Battery low indication bit

The battery low indication is periodically tested for a battery low

condition. If the decoder encounters a battery low condition, the

battery low indication bit is cleared low. The mC can only set the

BL bit high. Attempting to clear this bit has no effect.

The bit is not valid when the SPI circuit is enabled.

· User address format

A user address in the POCSAG code consists

of 21 bits. Three of the 21 bits are coded in the

frame number and are therefore not explicitly

transmitted. In the decoder, the addresses A,

B, C, D, E and F can use six different frames

respectively. Every address has to be explic-

itly enabled by resetting the associated en-

able bit.

Example:

Address decimal value: RICA=10535

Binary equivalent (14-bit): 10100100100111

Binary equivalent (18+3-bit):

000000010100100100111

A00 A01 A02 A03 A04 A05 A06

00000

A07 A08 A09 A10 A11 A12 A13

10010

A14 A15 A16 A17 FA2 FA1 FA0

00111

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