Telephone Signalling Transceiver / Least Cost Router
CMX860
1.5.12.8
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.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Bit:
IRQ
RD
PF
See below for uses of these bits
The meanings of the Status Register bits 12-9 and 7-0 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
b14
b13
b12
IRQ
Set to 1 on Ring Detect
Programming Flag bit. See 1.5.12.9
Set to 1 on Tx data ready.
b5
b4
b3
Cleared by write to Tx Data Register
Set to 1 on Tx data underflow.
Cleared by write to Tx Data Register
b11
b10
b3
b2
1 when energy is detected in Rx
1 when energy is detected in Call
Progress band or when both
programmable tones are detected
0
modem signal band
b9
1 when ‘1010..’ pattern is detected
in FSK modes
b1
b8
b7
Set to 1 on Hook Detect
b11
b1
1 when continuous 1’s pattern
detected in FSK modes
1 when 2100Hz answer tone or the
second programmable tone is
detected
b6
b5
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
1 when 2225Hz answer tone or the
first programmable tone is detected
b0
b0
1 when DTMF code is detected
b4
b3
b2
b1
b0
Set to 1 on Rx framing error
Set to 1 on even Rx parity
0
0
-
-
-
-
-
Rx DTMF code b3, see table
Rx DTMF code b2
Rx DTMF code b1
0
FSK frequency demodulator output Rx DTMF code b0
Note: ** This column shows the corresponding IRQ Mask bits in the General Control Register.
ã 2002 Consumer Microcircuits Limited
30
D/860/5
CMLMICRO [ CML MICROCIRCUITS ]
