Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 22)

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22 Rev. 1.3
Figure 3. Transmit Data Buffers
Figure 4. Receive Data Buffers
Table 20. Register U70 Signals INT Can Monitor
Signal U70 Bit Function
DCD 0 Data Carrier Detect—active high (inverse of DCD pin)
RI 1 Ring Indicator—active high (inverse of RI pin)
PPD 2 Parallel Phone Detect
OCD 3 Overcurrent Detect
CID 4 Caller ID Preamble Detect
796 Characters
128 Characters
1024 Character Elastic Tx Buffer
SRAM
CTS Deasserts
CTS Asserts
Transmit
14-Character
Hardware
Buffer
Tx Data
CTS
796 Characters
128 Characters
1024 Character Elastic Rx Buffer
SRAM
Receive
12-Character
Hardware
Buffer Rx data
RTS
RXF bit
REM bit
Parallel
Mode