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ST20-C1 データシート(PDF) 153 Page - STMicroelectronics

部品番号 ST20-C1
部品情報  Instruction Set Reference Manual
PDF  205 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20-C1 データシート(HTML) 153 Page - STMicroelectronics

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8 Instruction Set Reference
®
stop
stop process
Code: 23 F4
Description: Terminate the current process, saving the current Iptr and Wptr for later
use, and start the next process from the scheduling queue. If the scheduling queue is
empty then the CPU will become idle. This instruction is implemented in two stages to
protect interrupt latency. The first stage deschedules the current process and sets the
start_next_task status bit. The second stage clears the start_next_task status bit
and starts the next process. An interrupt may occur between the two stages.
Definition:
if (
stop trap handler installed)
take stop trap
else
{
word
′[Tdesc @ pw.Iptr]
← next instruction
word
′[Tdesc @ pw.Wptr]
← Wptr
Status
′
local_interrupt_enable
← set
Status
′
overflow
← clear
Status
′
undeflo w
← clear
Status
′
carry
← clear
Status
′
interrupt_mode
← clear
Status
′
trap_mode
← clear
Status
′
start_next_task
← clear
Status
′
timeslice_count
← MaxTimesliceCount
-- start next process on scheduling queue
if (frontptr = NotProcess)
-- queue is empty, so become idle
{
Status
′
sleep
← set
Status
′
user_mode
← clear
if (
idle trap handler installed)
take idle trap
else
set idle
}
else
-- processes waiting, so start next process
{
Status
′
sleep
← clear
Status
′
user_mode
← set
Tdesc
′← frontptr
Wptr
′← word [frontptr @ pw.Wptr]



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