DB929B datasheet(35/51 Pages) CMLMICRO

35 / 51 page

4-Level FSK Modem Data Pump

Page 35 of 50

MX929B PRELIMINARY INFORMATION

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Yes

RETURN

'STATE' = 4 ?

Set µC variable 'STATE' to 9

RETURN

(Error)

Decrement µC variable

'IBLOCKS'

Write 8 Last Block

data bytes to the Data Buffer

then write a TLB task to

the Command Register

Write6bytes FrameSync

pattern to the Data Buffer

then write a T24S task to

the Command Register

Write 10 Header Block

data bytes to the Data Buffer

then write a THB task to

the Command Register

Increment µC variable

'STATE'

Read Status Register

Yes

START

(

line goes low )

IRQ

RETURN

( Not MX929B IRQ )

IRQ bit = 1 ?

BFREE bit = 1 ?

'STATE' = 5 ?

'IBLOCKS' = 0 ?

'STATE' = 2 ?

Yes

IBEMPTY bit = 1 ?

Yes

'STATE' = 3 ?

Yes

'STATE' = 0 ?

IBEMPTY bit = 1 ?

Write 12 Intermediate Block

data bytes to the Data Buffer

then write a TIB task to

the Command Register

Yes

Value of C variable 'STATE' on entry to IRQ routine

and corresponding MX929B's actions:

Symbol Sync pattern being transmitted,

load Frame Sync pattern & T24S task.

Frame Sync pattern being transmitted,

load Station ID bytes and TSID task.

Station ID Block being transmitted,

load Header Block bytes &THB task.

Header or Intermediate Block being trransmitted

load Intermediate or Last Block bytes & TIB or TLB task.

Last block being transmitted,

ignore this interrupt.

Waiting for end of transmission,

finish on interrupt with IBEMPTY bit set.

Write 3 Station ID bytes

to the Data Buffer

then write a TSID task to

the Command Register

Yes

'STATE' = 1 ?

Figure 20: Tx Interrupt Service Routine

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