CMX860 查看數據表（PDF） - MX-COM Inc

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CMX860

Telephone Signaling Transceiver

MX-COM Inc  

Telephone Signaling Transceiver

15

CMX860 Advance Information

4.11 Analog Signal Routing

The routing of signals to and from the Line and Phone interfaces is performed by bits 0 to 3 of the Analog

Signal Path Register. Please note that bits 4 to 7 of this register are reserved for future use and should be set

to zero for the moment.

4.12 C-BUS Interface

This block provides for the transfer of data and control or status information between the CMX860’s internal

registers and the µC over the C-BUS serial bus. Each transaction consists of a single Register Address byte

sent from the µC which may be followed by one or more data byte(s) sent from the µC to be written into one

of the CMX860’s Write Only Registers, or one or more byte(s) of data read out from one of the CMX860’s

Read Only Registers, as illustrated in Figure 13.

Data sent from the µC on the Command Data line is clocked into the CMX860 on the rising edge of the Serial

Clock input. Reply Data sent from the CMX860 to the µC is valid when the Serial Clock is high. The CS line

must be held low during a data transfer and kept high between transfers. The C-BUS interface is compatible

with most common µC serial interfaces and may be easily implemented with general-purpose µC I/O pins

controlled by a simple software routine. Figure 21 provides detailed C-BUS timing requirements.

The following C-BUS addresses and registers are used by the CMX860:

Register

General Reset Command (address only, no data).

General Control Register

Transmit Mode Register

Receive Mode Register

Transmit Data Register

Receive Data Register

Status Register

Programming Register

Analog Signal Path Register

Read/Write

16-bit write only

16-bit write-only

16-bit write-only

8-bit write only

8-bit read-only

16-bit read-only

16-bit write-only

8-bit write-only

Address

$01

$E0

$E1

$E2

$E3

$E5

$E6

$E8

$EC

Notes:

1. The C-BUS addresses $E9, $EA and $EB are allocated for production testing and should not be

accessed in normal operation.

2. The C-BUS address $E4 is allocated for internal use and should not be accessed in normal operation.

3. In several registers, there are bit patterns whose function is not specified. These modes should not be

accessed in normal operation and no guarantee is given that any use of these bits will be supported in the

future.

¤2000 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480222.001

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