Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario descargar pdf (Pagina 219)

Detailed Flowcharts

Appendix D

D15

Figure D.17

TRANSMIT

INTERRUPT Subroutine

11670

WAKEUP

TRANSMIT

INTERRUPT

RETURN

Resume Process

NOTE:

a Z80 S10.

This figure assumes the use of

NOTE:

UART transmit interrupt must

be enabled and disabled without

affecting the current state of the

receive

enable flags.

and status interrupt

Sleeping at

TXWAIT

Figure D.18

SLEEP and W

AKEUP Subroutines

11671

RETURN

Input

The address of a Sleep Variable.

Sleep Variables

Typically an address of a stack or

a process or context save area.

A process can suspend itself and

place its address in a Sleep

Variable.

Subsequently another process can

wake up the sleeping process by

referring to Sleep Variable. When

no process is sleeping at a Sleep

Variable, a WAKEUP has no effect.

Input

The address of a

SLEEP WAKEUP

•

An Implementation-

Dependent Routine to

Suspend Own Process

at a Sleep Variable Until

Another Process Wakes

This One Up

An Implementation-

Dependent Routine

to Wake Up the Process

at a Sleep Variable

Any Is Sleeping There

Sleep Variable.

1 2 ... 214 215 216 217 218 219 220 221 222 223 224 ... 234 235

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