CMX813 データシートの表示（PDF） - CML Microsystems Plc
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CMX813 Datasheet PDF : 21 Pages
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Multi-Standard Analogue Paging Decoder
CMX813
TONE ADDRESS Register (Hex address $31)
This register is used to load ROM addresses to the internal RAM for decode as described below:
TONE ADDRESS
(Bits 7, 6, 5, 4, 3, 2, 1,
and 0)
The parameters (centre frequency) for decoding each tone in the tone table
are stored in a decoding ROM, and any one of these tones can be selected
for decoding via this 8-bit ROM address. The tones table and address
allocations are listed in the Application Notes, Section 1.6.
For a 1 tone or 2 tone system, up to eight ROM addresses can be loaded to
the RAM for decode from a chosen ROM page. A FIFO system is used for
loading the RAM memory. If more than 8 ROM addresses were loaded to the
RAM, only the last 8 entries will be stored.
For the 5/6 tone and HSC tone system, Bits 7, 6, 5, and 4 are used to select
a specific tone set (CCIR/ZVEI etc.) for decode. The decode algorithm will
search automatically through the sixteen ROM addresses associated with the
chosen tone set.
Bits 3, 2, 1, and 0 are not used and should be set to 0.
8-bit Read Only Registers
HEX
ADDRESS/
COMMAND
REGISTER
NAME
BIT 7
(D7)
BIT 6
(D6)
BIT 5
(D5)
DECODED
$38
TONE
MSB
ADDRESS BIT 7
BIT6
BIT 5
Reserved set to
$3F
STATUS
1
1
0
BIT 4
(D4)
BIT 3
(D3)
BIT 2
(D2)
DECODED TONE ADDRESS
BIT 4
RAM
FULL
BIT 3
DECODE
STATUS
CHANGE
BIT 2
TONE
DECODE
BIT 1
(D1)
BIT 0
(D0)
BIT 1
LSB
BIT 0
DECODED ROM PAGE
MSB
LSB
BIT 1
BIT 0
Read Only Register Description
DECODED TONE ADDRESS Register (Hex address $38)
This register is used to send the decoded ROM addresses to the host micro as described below:
DECODED
TONE ADDRESS
(Bits 7, 6, 5, 4, 3, 2, 1,
and 0)
When a tone is decoded, the CMX813 generates an interrupt and reports the
decoded tone table 8-bit ROM address. The tone table and address
allocations are listed in the Application Notes, Section 1.6.
For the 1 tone or 2 tone system, the 8-bit ROM address is located either from
ROM PAGE 1 or 2.
For the 5/6 tone and HSC tones system, Bits 7, 6, 5, and 4 represent the
selected tone set (CCIR/ZVEI etc), Bits 3, 2, 1, and 0 are the 4 bit
Hexadecimal tone value within the selected group. This is located in ROM
PAGE 3.
© 2000 Consumer Microcircuits Limited
9
D/813/33
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