MX809 查看數據表（PDF） - MX-COM Inc

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产品描述 (功能)

生产厂家

MX809

1200bps MSK Modem

MX-COM Inc  

MSK Modem

16

6.5 RX Timing

A – Address bytes

C – Checksum bytes

D – Data bytes

H – Hang bit

P – Preamble bytes

- Don’t care state

TX only – In TX, Preamble, and SYNC are

loaded as data from the microcontroller.

6.5.1 RX SYNC / SYNC Required Before Every Message, Rx Checksum Not Enabled

MX809

RX/TX

RX INPUT

IRQ

READ STATUS REGISTER

SYNC DETECT

(OR SYNC DETECT)

RX DATA READY

READ RX DATA BUFFER

SYNC/SYNC PRIME

CHECKSUM ON/OFF

P1 P2 P

NOTE 1

SYNC

A1 A2 A3 A SYNC

NOTE 2 NOTE 3

A1 A2 A3

A1 A2 A3 A

Figure 9: RX SYNC / SYNC Required Before Every Message, RX Checksum not Enabled

Notes:

1. Any number of preamble bits can occur here.

2. Any number of address/data bytes can occur here.

3. Any number of bits can occur here

4. RX Freeformat set high.

6.5.2 RX Additional Data Follows Initial Address (6 Data & 2 Checksum Bytes) Data, RX checksum

Enabled

RX/TX

RX INPUT

IRQ

READ STATUS

REGISTER

SYNC DETECT

(OR SYNC

DETECT)

RX DATA READY

READ RX

DATA BUFFER

RX CHECKSUM

TRUE

SYNC/SYNC

PRIME

CHECKSUM

ON/OFF

P1 P2 P

NOTE 1

SYNC

A1 A2 A3 A4 A5 A6 C1 C2 D1 D2 D3 D4 D5 D6 C1 C2 D1

Figure 10: RX Additional Data Follows Initial Address (6 Data & 2 Checksum Bytes) Data , RX

Checksum Enabled

Notes:

1. Any number of preamble bits can occur here.

2. RX Freeformat set high.

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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