參數(shù)資料
型號(hào): DRM010
英文描述: Vacuum Cleaner Designer Reference Manual
中文描述: 吸塵器設(shè)計(jì)參考手冊(cè)
文件頁(yè)數(shù): 54/72頁(yè)
文件大?。?/td> 1177K
代理商: DRM010
Reference Design Code
Designer Reference Manual
DRM010 — Rev 0
54
Reference Design Code
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
returns
: unsigned int time (in X:A)
type
: inline assembler, no entry or exit
description:
This function read the time from the timer counter.
The entire function is in assembler. It is necessary to read the
timer channels in the specified order. The function returns the
sixteen bit value.
This function depends on the compiler returning the value in the
X:A register. It will generate return value expected warning
because the return value is not specified in C syntax.
*******************************************************************************/
#pragma NO_ENTRY
#pragma NO_EXIT
#pragma NO_FRAME
unsigned int readTCNT(void)
{
asm {
ldx TCNTH_;
lda TCNTL_;
rts;
}
}
/******************************************************************************
function
: mul()
parameters
: unsigned char x,y (in X and A)
returns
: unsigned int z (in X:A)
type
: inline assembler, no entry or exit
description:
This function will multiply two 8 bit numbers together and return
a sixteen bit value. It is coded entirely in assembler and is very
efficient (two bytes!).
This function is used to provide an efficient 8 x 8 multiply. An
ANSI standard C compiler would normally promote two unsigned char
to unsigned ints before multiplication, resulting in inefficient
code.
*******************************************************************************/
#pragma NO_ENTRY
#pragma NO_EXIT
F
Freescale Semiconductor, Inc.
n
.
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