CMX867D2 CML Microcircuits, CMX867D2 Datasheet - Page 27

• Manufacturer Part Number: CMX867D2
• Description: Low power V.22 modem
• Manufacturer: CML Microcircuits

Low Power V.22 Modem
1.5.10.7
Status Register: 16-bit read-only.
Bits 15 and 13-0 of this register are cleared to 0 by a General Reset command, in Powersave mode, or
when b7 (Reset) of the General Control Register is 1.
The meanings of the Status Register bits 12-0 depend on whether the receive circuitry is in Modem or
Tones Detect mode.
2001 Consumer Microcircuits Limited
Bit:
IRQ
Status Register bits:
15
b15
b14
b13
b12
b11
b10
Status Register
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
RD
14
1 when energy is detected in Rx
modem signal band
1 when double DPSK dibit 00,11
pattern is detected in 1200bps
DPSK mode, or when ‘1010..’
pattern is detected in all other
modes
See following table
See following table
Set to 1 on Rx data ready.
Cleared by read from Rx Data
Register
Set to 1 on Rx data overflow.
Cleared by read from Rx Data
Register
Set to 1 on Rx framing error
Set to 1 on even Rx parity
DPSK Rx signal quality b2
DPSK Rx signal quality b1
DPSK Rx signal quality b0
or FSK frequency demodulator
output
PF
13
12
Rx Modem modes
11
Cleared by write to Tx Data Register
Cleared by write to Tx Data Register
10
Programming Flag bit. See 1.5.10.8
C-BUS address $E6
Set to 1 on Tx data underflow.
Set to 1 on Tx data ready.
Set to 1 on Ring Detect
9
See below for uses of these bits
8
27
IRQ
7
1 when energy is detected in Call
Progress band or when both
programmable tones are detected
0
0
1 when 2100Hz answer tone or the
second programmable tone is
detected
1 when 2225Hz answer tone or the
first programmable tone is detected
1 when DTMFcode is detected
0
Rx DTMF code b3, see table
Rx DTMF code b2
Rx DTMF code b1
Rx DTMF code b0
6
Rx Tones Detect modes
5
4
3
2
1
** IRQ
Mask bit
0
CMX867
b5
b4
b3
b3
b2
b1
b1
b1
b0
b0
D/867/2
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