參數(shù)資料
型號： HIF_SPEC
英文描述： EZ-030 Demonstration Board Theory of Operation Host Interface (HIF) Specification
中文描述： 易- 030演示板的經(jīng)營理論主機接口（誘導(dǎo)因子）規(guī)格
文件頁數(shù)： 76/118頁
文件大小： 356K
代理商： HIF_SPEC
3–52
Host Interface (HIF) Specification
76
Example Call
pagsiz:
.word
0
const
gr121,273
;service = 273
asneq
69,gr1,gr1
;call the OS
jmpf
gr121,clk_err
;jump if error
const
gr120,time
;set address where
consth
gr120,time
;time is to be stored
store
0,0,gr96,gr120
;store the time in ms.
The example calls the operating system kernel to get the current value of the
system clock in milliseconds. On return, if
gr121
contains a boolean FALSE
value, the program jumps to
clk_err
to handle the error; otherwise, the time in
milliseconds is stored in the variable
time
.
The return value from the clock service does not include system I/O data-
transfer time incurred by HIF services with service numbers less than 256. The
return value is related to the value returned by the cycles service, in that it is
derived from the processor cycles counter, but scaled by the processor
frequency and resolved to milliseconds.
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