Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Uživatelský manuál stáhnout pdf (Strana 226)

Detailed Flowcharts

Appendix D

D16

Figure D.18

TRANSMIT

INTERRUPT Subroutine

10088-I

WAKEUP

TRANSMIT

INTERRUPT

RETURN

Resume Process

Sleeping

TXWAIT

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

flags.

and status interruptenable

Figure D.19

SLEEP and W

AKEUP Subroutines

10089-I

RETURN

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

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 Variable.

SLEEP

WAKEUP

•

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