Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 226)

Detailed Flowcharts
Appendix D
DĆ22
Figure D.27
GETRAW Subroutine
GETRAW
Disable Proces-
sor
Interrupts
Enable UART
Receive Interrupt
Byte in
UART
?
Disable UART
Received Interrupt
Check Parity,
Framing, and
Receiver Overrun
SLEEP
Wait for RXD
Interrupt at
RXDWAIT
Error
?
Get Byte
from UART
Enable Proces-
sor
Interrupts
RETURN
Set Receiv-
er
Error Flag
Discard
Bad Data
Reset UART
Error Flag
11680
No
Yes
Yes
No
NOTE:
use of a Z80 S10.
This figure assumes the