FX818 查看數據表（PDF） - CML Microsystems Plc

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FX818

CTCSS Signalling Processor

CML Microsystems Plc 

CTCSS Signalling Processor

FX818

CTCSS RX TONE

(Bits 3, 2, 1 and 0)

These four bits hold a Hex number from $0 to $F. Numbers $0 to $E represent

the address of the CTCSS tone decoded according to the tones programmed in

the CTCSS RX PROGRAM Register, $84. The Hex number $F indicates the

presence of any tone that is not described by CTCSS DECODER BANDWIDTH

(Bits 7, 6, 5 and 4, SUB-AUDIO SET-UP Register, $82) and CTCSS

FREQUENCY (Bits 11 - 0, CTCSS RX PROGRAM Register, $84).

IRQ FLAG Register (Hex address $8F)

This register is used to indicate when the device requires attention as below:

(Bits 7, 5, 4, 1 and 0) Reserved for future use. These will be set to "0" but should be ignored by user's

software.

GPT IRQ FLAG

(Bit 6)

When the general purpose timer has reached zero in its internal register, this bit

will be set to "1" to indicate the timeout has expired. This bit is cleared to "0" by a

read of the IRQ FLAG Register (Hex address $8F).

CTCSS IRQ FLAG

(Bit 3)

When CTCSS RX DECODE (Bit 4, SUB-AUDIO STATUS Register, $81)

changes state this bit will be set to "1".

This bit is cleared to "0" by a read of the IRQ FLAG Register (Hex address $8F).

CTCSS FAST IRQ

FLAG

(Bit 2)

When CTCSS FAST TONE (Bit 6, SUB-AUDIO STATUS Register, $81) changes

state this bit will be set to "1".

This bit is cleared to "0" by a read of the IRQ FLAG Register (Hex address $8F).

© 1997 Consumer Microcircuits Limited

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