MX809J Ver la hoja de datos (PDF) - MX-COM Inc
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MX809J Datasheet PDF : 22 Pages
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MSK Modem
9
MX809
5.3 Write to Control Register
This “Write Only” register directs the Modem’s operation.
SYNC : When set, this bit enables SYNC Word detection. It is cleared on a successful SYNC Word
detection.
SYNC Prime: When set, this bit enables SYNC Word detection. It is cleared on a successful SYNC Word
detection.
Interrupt Enable: When set, this bit allows interrupts to be output by the MX809 on the IRQ line.
Powersave: Used in conjunction with the Wake input (see Section 2) to control the Powersave state of the
MX809.
Checksum Enable: When set:
In TX: A 2-byte checksum is generated and transmitted after every 6 bytes transmitted.
In RX: After every 8 received bytes (6 information + 2 checksum) the checksum word is checked. If
the checksum is correct, the RX Checksum True bit in the Status Register is set to a logic “1”. When
this bit is a logic “0” no checksum are generated or checked.
Note: Checksum operation is inhibited during the SYNC / SYNC search period.
Setting
MSB
Bit 7
6
5
0
1
4
0
1
3
0
1
2
0
1
1
0
1
0
0
1
Control bits
Transmitter first
Not Used
Set to “0”
Not Used
Set to “0”
SYNC Prime
Primed
SYNC Prime
Primed
Interrupt Enable
Disable
Enable
Powersave
Normal Operation
Powersave
Checksum Enable
Disable
Enable
RX/TX Mode
RX
TX
Table 7: Control Register
5.4 RX Data buffer -- “Read RX Data Buffer”
This “Read Only” register contains the last byte of data received from the Data Register. Data is received Bit
7 (MSB) first.
MSB
LSB
7 654321 0
RX Data Buffer
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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