HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 346

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

9.1.3
Initialization: An example of an initialization program is given below.
CMD fl 21H........................................ Resets channel.
MD0
MD2
CTL
RRC
RXS
IE0
Rev. 0, 07/98, page 330 of 453
fl 44H........................................ Specifies bi-sync mode.
fl 00H........................................ Specifies the NRZ code.
fl 05H........................................ Specifies SYN character load.
fl 00H........................................ RXRDY = 1 when the receive buffer is not empty.
fl 00H........................................ Specifies RXC line input for the receive clock.
fl 41H........................................ Enables RXINT interrupts.
Reception by Programmed I/O (Bi-Sync Mode)
Figure 9.2 TXINT Interrupt Processing Routine (using HD64180)
Analyze interrupt source
Issue EI instruction
Process interrupt
Clear interrupt
(ACC
(ST1
Read ST1
source bit
Return
Start
ACC)
ST1)
Disables the auto-enable function.
Specifies CRC-16 mode, and presets to all 0s.
Specifies full-duplex mode.
Enables RXRDY interrupts.
ACC:
ST1:
Accumulator
Status register 1