MX919B View Datasheet(PDF) - MX-COM Inc
Part Name
Description
MFG CO.
'MX919B' PDF : 48 Pages View PDF
4-Level FSK Modem Data Pump
Page 32 of 47
MX919B PRELIMINARY INFORMATION
RETURN
( Not MX919B IRQ )
START
( IRQ line goes low )
Read Status Register
No
IRQ bit = 1 ?
Yes
Value of µC variable 'STATE' on entry to IRQ routine
and corresponding MX919B's actions:
0: Symbol Sync pattern being transmitted,
load Frame Sync pattern & T24S task.
1: Frame Sync pattern being transmitted,
load Header Block bytes and THB task.
2: Header or Intermmediate Block being transmitted,
load Intermediate or Last Block bytes & TIB or TLB task.
3:
Last block
ignore this
bine.tienrgrutprat.nsmitted,
4: Waiting for end of transmission,
finish on interrupt with IBEMPTY bit set.
E
No
BFREE bit = 1 ?
Yes
'STATE' = 4 ?
Yes
No
E
No
IBEMPTY bit = 1 ?
Yes
E
Yes
IBEMPTY bit = 1 ?
E
Set µC variable 'STATE' to 9
RETURN
( Error )
No
'STATE' = 0 ?
No
'STATE' = 1 ?
No
'STATE' = 2 ?
Write 6 byte Frame Sync
Yes
pattern to the Data Buffer
then write a T24S task to
the Command Register
Write 10 Header Block
Yes
data bytes to the Data Buffer
then write a THB task to
the Command Register
No
Yes
E
No
'STATE' = 3 ?
Yes
Write 12 Intermediate Block
Write 8 Last Block
data bytes to the Data Buffer
No
'IBLOCKS' = 0 ?
Yes
data bytes to the Data Buffer
then write a TIB task to
then write a TLB task to
the Command Register
the Command Register
Decrement µC variable
'IBLOCKS'
Increment µC variable
'STATE'
RETURN
Figure 20: Tx Interrupt Service Routine
RETURN
©2001 MX•COM, INC.
www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480170.003
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