CMX878 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX878' PDF : 63 Pages View PDF
Line Powered Modem plus DAA
CMX878
1.5.12.13 Status Register
Status Register: 16-bit read-only. C-BUS address $E6
Bits 13-0 of this register are cleared to 0 by a General Reset command or when b7 (Reset) of the
General Control Register is 1.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
IRQ RD PF
See below for uses of these bits
The meanings of the Status Register bits 12-0 depend on whether the receive circuitry is in Modem or
Tones Detect mode.
Status Register bits:
Rx Modem modes
Rx Tones Detect modes
** IRQ
Mask bit
b15
IRQ
b14
Set to 1 when a Line/Wakeup Event has occurred
b5
b13
Programming Flag bit. See 1.5.12.14
b4
b12
Set to 1 on Tx data ready.
b3
Cleared by write to Tx Data Register
b11
Set to 1 on Tx data underflow.
b3
Cleared by write to Tx Data Register
b10 1 when energy is detected in Rx
1 when energy is detected in Call
b2
modem signal band
Progress band or when both
programmable tones are detected
b9 1 when S1 pattern (double DPSK 0
b1
dibit 00,11) is detected in DPSK or
QAM modes, or when ‘1010..’
pattern is detected in FSK modes
b8 See following table
0
b1
b7 See following table
1 when 2100Hz answer tone or the
b1
second programmable tone is
detected
b6 Set to 1 on Rx data ready.
Cleared by read from Rx Data
Register
1 when 2225Hz answer tone or the
b0
first programmable tone is detected
b5 Set to 1 on Rx data overflow.
1 when DTMF code is detected
b0
Cleared by read from Rx Data
Register
b4 Set to 1 on Rx framing error
0
-
b3 Set to 1 on even Rx parity
Rx DTMF code b3, see table
-
b2 QAM/DPSK Rx signal quality b2
Rx DTMF code b2
-
b1 QAM/DPSK Rx signal quality b1
Rx DTMF code b1
-
b0 QAM/DPSK Rx signal quality b0
Rx DTMF code b0
-
or FSK frequency demodulator
output
© 2002 Consumer Microcircuits Limited
41
D/878/2
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