CMX813 Просмотр технического описания (PDF) - CML Microsystems Plc
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CMX813 Datasheet PDF : 21 Pages
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Multi-Standard Analogue Paging Decoder
CMX813
Write Only Register Description
GENERAL RESET (Hex address $01)
The reset command has no data attached to it. It sets the device (write) registers to zero and enters the
Zero Power mode. And all RAM contents and RAM FULL bit of the STATUS Register are reset to 0.
CONTROL Register (Hex address $30)
This register is used to control the functions of the device as described below:
ROM PAGE
These two bits select the section of the ROM where pre-programmed tone data
SELECT
are stored for detection. The ROM area is divided into three sections (pages). The
(Bits 7 and 6) 1 tone or 2 tone system tones are stored in ROM Page 1 and 2. The 5/6 tone and
HSC tones are stored in ROM Page 3.
Bit 7 Bit 6
ROM PAGE
0
0 No ROM PAGE selected, a valid but unrecognised tone may be
detected, no interrupt generated
0
1 ROM Page 1 selected, for 1 tone or 2 tone system
1
0 ROM Page 2 selected, for 1 tone or 2 tone system
1
1 ROM Page 3 selected, for 5/6 tone or HSC tone system
DECODER
BANDWIDTH
(Bits 5, 4, 3 and
2)
Bit 5
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
These four bits set the bandwidth of the tone
decoder according to the table below:
Bit 4
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Bit 3
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Bit 2
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
BANDWIDTH
Nominal Decode
±0.1%
±0.3%
±0.5%
±0.7%
±0.9%
±1.1%
±1.3%
±1.5%
±1.7%
±1.9%
±2.1%
±2.3%
±2.5%
±2.7%
±2.9%
±3.1%
OPERATION MODE
(Bits 1 and 0)
Bit 1
0
0
1
1
These two bits select the mode of operation of the device.
Bit 0
0
1
0
1
OPERATION MODE
Zero Power
Clear RAM, all RAM contents and RAM FULL bit of the STATUS
Register are reset to 0.
Normal operation, decode enabled
Reserved
© 2000 Consumer Microcircuits Limited
8
D/813/33
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