CMX644AD5 데이터 시트보기 (PDF) - MX-COM Inc
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CMX644AD5 Datasheet PDF : 31 Pages
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Bell 212A / V.22 Modem with Call Progress and DTMF
7
CMX644A Preliminary Information
4 General Description
4.1 ‘C-BUS’ Serial Interface
This block provides for the transfer of data and control or status information between the CMX644A’s internal
registers and the µC over the ‘C-BUS’ serial bus. Each 'C-BUS' transaction consists of a single Register
Address byte sent from the µC, as illustrated in Figure 3, which may be followed by either of:
1. A single data byte sent from the µC to be written into one of the CMX644A’s Write Only Registers, as
illustrated in Figure 4.
2. A single byte of data read out from one of the CMX644A’s Read Only Registers, as illustrated in Figure 5.
Data sent from the µC on the COMMAND DATA line is clocked into the CMX644A on the rising edge of the
SERIAL CLOCK input. REPLY DATA sent from the CMX644A to the µC is valid when the SERIAL CLOCK is
high. The interface is compatible with the most common µC serial interfaces such as SCI, SPI and Microwire,
and may be easily implemented with general purpose µC I/O pins controlled by a simple software routine.
See Figure 15 for detailed ‘C-BUS’ timing requirements.
CS
SERIAL CLOCK
COMMAND DATA
REPLY DATA
765432 10
Address (01 Hex = Reset)
Hi-Z
= Level not important
Figure 3: C-BUS Transactions (Single byte from µC)
CS
SERIAL CLOCK
COMMAND DATA
REPLY DATA
765432 10
Address
Hi-Z
765432 10
Data to CMX644A
Figure 4: C-BUS Transactions (One Address and one Data byte from µC)
CS
SERIAL CLOCK
COMMAND DATA
REPLY DATA
Hi-Z
765432 10
Address
765432 10
Data from CMX644A
Figure 5: C-BUS Transactions (One Address byte from µC and one Reply byte from CMX644A)
2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480197.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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