HD64570 Datasheet, PDF(345/469 Page) Hitachi Semiconductor – Serial Communications Adaptor

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HD64570 Datasheet, PDF (345/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

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Start

Load memory data

to ACC

ACC data = E

Yes

ETX or ETB?

Yes

ACC data = ETX?

Issue EOM

(CMD â 00000110)

No

No

Issue EOM

(CMD â00000110)

Write ACC data

(ETX) to TRB and

transmit

Write ACC data to

TRB and transmit

Issue TX disable

command

(CMD â00000011)

Issue EI instruction

Return

ACC: Accumulator

CMD: Command register

TRB: TX/RX buffer register

EOM: End of message command

ETX: Control character (end of text)

ETB: Control character (end of block)

Figure 9.1 TXRDY Interrupt Processing Routine (using HD64180)

Rev. 0, 07/98, page 329 of 453

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