M-8888-01 Clare Inc., M-8888-01 Datasheet - Page 7

• Manufacturer Part Number: M-8888-01
• Description: DTMF Transceiver
• Manufacturer: Clare Inc.

Equations
Staus Register Description
Rev. 1
Common Crystal Connection
Application Circuit (Single-Ended Input)
Bit
b0
b1
b2
b3
IRQ
Transmit data register empty
(burst mode only)
Receive data register full.
Delayed Steering
Name
Interrupt has occurred. Bit one (b1)
and/or bit 2 (b2) is set.status register is read.
Pause duration has terminated and transmitter
is ready for new data.
Valid data is in the receive data register.
Set on valid detection of the absence of a
DTMF signal.
Status Flag Set
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CRB Bit Positions
Internal Register Functions
CRA Bit Positions
RS0
0
0
1
1
RSEL
C/R
b3
b3
RD
1
0
1
0
S/D
b2
IRQ
b2
Interrupt is inactive. Cleared after
when not in burst mode.
Cleared on detection of a valid DTMF
signal.
Cleared after status register is read or
Cleared after status register is read.
WR
0
1
0
1
Status Flag Cleared
CP/DTMF
TEST
Function
Write to transmitter
Read from receiver
Write to control register
Read from status register
b1
b1
BURST
TOUT
M-8888
b0
b0
7