CMX867D2 CML Microcircuits, CMX867D2 Datasheet - Page 26

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

Low Power V.22 Modem
1.5.10.5
Tx Data Register: 8-bit write-only.
In Synchronous Tx data mode this register contains the next 8 data bits to be transmitted. Bit 0 is
transmitted first.
In Tx Start-Stop mode the specified number of data bits will be transmitted from this register (b0 first). A
Start bit, a Parity bit (if required) and Stop bit(s) will be added automatically.
This register should only be written to when the Tx Data Ready bit of the Status Register is 1.
C-BUS address $E3 should normally be used, $E4 is for implementing the V.14 overspeed transmission
requirement in Start-Stop mode, see section 1.5.1.
1.5.10.6
Rx Data Register: 8-bit read-only.
In unformatted Rx data mode this register contains 8 received data bits, b0 of the register holding the
earliest received bit, b7 the latest.
In Rx Start-Stop data mode this register contains the specified number of data bits from a received
character, b0 holding the first received bit.
2001 Consumer Microcircuits Limited
Bit:
Bit:
7
7
6
6
Tx Data Register
Rx Data Register
Data bits to be transmitted
5
5
Received data bits
4
4
3
3
2
2
C-BUS addresses $E3 and $E4
C-BUS address $E5
1
1
0
0
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CMX867
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