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(jī)接口(誘導(dǎo)因子)規(guī)格
文件頁數(shù): 78/118頁
文件大小: 356K
代理商: HIF_SPEC
3–54
Host Interface (HIF) Specification
78
Example Call
cycles:
.word
0
;MSb of cycles
.word
0
;LSb of cycles
const
gr121,274
;service = 274
asneq
69,gr1,gr1
;call the OS
jmpf
gr121,cyc_err
;jump if error
const
gr120,cycles
;set the address where
consth
gr120,cycles
;the count is to be
;stored
store
0,0,gr97,gr120
;store the MSb,
add
gr120,gr120,4
;increment the address,
store
0,0,gr96,gr120
;then store the LSb of
;cycles.
The example-call program fragment calls the operating-system service 274 to
access the number of CPU cycles that have elapsed since processor
initialization. The cycle count (in
gr96
and
gr97
) is stored in the two words
addressed by the variable
cycles
if the service call is successful. If
gr121
contains a boolean FALSE value on exit, the program jumps to
cyc_err
to
handle the error condition.
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