CMX813 Просмотр технического описания (PDF) - MX-COM Inc

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CMX813

Multi-standart analog paging decoder

MX-COM Inc  

CMX813 Multi-Standard Analog Paging Decoder

9

CMX813 Advance Information

Bit 1

0

0

1

1

Bit 0

0

1

0

1

DECODED ROM PAGE

A valid but unrecognized tone

Decoded tone in ROM Page 1

Decoded tone in ROM Page 2

Decoded tone in ROM Page 3

Table 6: DECODED ROM PAGE (Bits 1 and 0)

If the DECODE STATUS CHANGE (Bit 3) of the STATUS Register is ‘1’ or the RAM FULL (Bit 4) of the

STATUS Register changes from ‘0’ to ‘1’ then the IRQ output will be pulled low.

Reading the STATUS register, clears the interrupt ( IRQ output pulled high) and also, clears Bit 3 of the

STATUS Register, if set. A Clear RAM command clears Bit 4 of the STATUS Register, if set.

In Zero Power mode, Status Register Bits 7 to 0 are preset to “110x0000” respectively. RAM FULL (Bit 4)

remains undisturbed.

6. Application Notes

6.1 General

The device should be reset first by the command GENERAL RESET $01.

The decoder should then be set up according to the desired characteristics. This entails setting the

DECODER BANDWIDTH and select the ROM PAGE in the CONTROL Register $30, also selecting tones in

the chosen ROM PAGE by TONE ADDRESS Register $31 (programming the center frequencies of the

desired tones).

Up to 8 tones can be programmed either from ROM PAGE 1 or ROM PAGE 2. The RAM memory location 1

is loaded first then incrementally loaded to location 8. Alternatively, a tone group can be selected from ROM

PAGE 3.

The decoder is enabled by the CONTROL Register $30.

During operation when the device is receiving, the tones are scanned in the sequence of their location; once a

tone is detected, the remaining tones are not checked.

When the decoder detects a change in its present state an interrupt will be generated. The change that

occurred can be read from Bit 3 of the STATUS Register $3F if a tone is detected. NOTONE is indicated by

Bit 2 of the same register. The ROM PAGE of that tone can be read from Bits 1 and 0 of the same register.

The interrupt is cleared by reading the STATUS Register. The decoded tone address can be read from the

DECODED TONE ADDRESS Register $38

¤2000 MX-COM, Inc.

www.mxcom.com tel: 336 744 5050 800 638 5577 fax: 336 744 5054

Doc. # 20480220.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201, USA All trademarks and service marks are held by their respective customers.

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