MX809 查看數據表（PDF） - MX-COM Inc

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MX809

1200bps MSK Modem

MX-COM Inc  

MSK Modem

Pin

Signal

21 Serial Clock

22 Address Select

23 Wake

24 VDD

5

MX809

Description

This is the ‘C-BUS’ serial Clock input. This clock, produced by the

microcontroller, is used for transfer timing of commands and data to and from the

MSK Modem. See Section 6 and Section 7.1.4.

This pin enables two MX809s to be used on the same C-BUS, providing full-

duplex operation. When at a logic “1” Address/Command bytes (with the

exception of a General Reset) must have bit 3 set to a logic “1” to address this

device. See Table 5 and Table 6.

This input can be used to reactivate the MX809 from Powersave. The device will

be in Powersave when both this pin and bit 2 of the Control Register are set to

logic “1”. Recovery from Powersave is achieved by putting either the Wake pin or

the Powersave bit in the Control Register to logic “0”. This allows MX809

activation by the microcontroller or an external signal, such as R.S.S.I. or Carrier

Detect. See Table 3.

Positive supply. A single +5.0V power supply is required. Levels and voltages

within the MSK Modem are dependent upon this supply.

Table 1: Signal List

TX Idle

RX Data Ready

TX Data Ready

RX SYNC Detect

RX Sync Detect

Interrupt outputs can be disabled by bit 3 of the Control Register

Table 2: IRQ Conditions

Powersave (CR bit 2)

1

0

1

0

Wake

1

1

0

0

MX809 Condition

Powersave

Enabled

Enabled

Enabled

Table 3: Wake and Powersave Conditions

1998 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480036.004

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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