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參數(shù)資料
| 型號(hào)： | PULSE |
| 英文描述： | Pulse Period/Width Measurement on the M16C/62 |
| 中文描述： | 脈沖持續(xù)時(shí)間/寬度測(cè)量的雙隨機(jī)PWM |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大小： | 410K |
| 代理商： | PULSE |
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Pulse Period/Width Measurement on the M16C/62
M16C
#include "sfr62.h"
#define B1TIME_CONFIG 0x42 /* 01000010 value to load into timer B1 mode register
||||||||_ TMOD0,TMOD1: PULSE MEASUREMENT MODE
||||||____ MR0,MR1: PULSE PERIOD MODE
||||_______MR2: = 0 FOR PULSE MEASUREMENT
|||_______ MR3: OVERFLOW FLAG
||________ TCK0,TCK1: F DIVIDED BY 8 SELECTED */
#define B0TIME_CONFIG 0x4a /* 01001010 value to load into timer B0 mode register
||||||||_ TMOD0,TMOD1: PULSE MEASUREMENT MODE
||||||____ MR0,MR1: PULSE WIDTH MODE
||||_______MR2: = 0 FOR PULSE MEASUREMENT
|||_______ MR3: OVERFLOW FLAG
||________ TCK0,TCK1: F DIVIDED BY 8 SELECTED */
#define CNTR_IPL 0x03 // TB0 priority interrupt level
int period,widthlow,width_hi;
//prototypes
void init(void);
#pragma INTERRUPT /B TimerB0Int
void TimerB0Int(void);
/*****************************************************************************
Name: TimerB0Int()
Parameters: none
Returns: nothing
Description: Timer B0 Interrupt Service Routine. The overflow flag is check
to determine if the TB0 register contains valid data. If so, the
input is tested to determine if the value in the TB0 register
is the high pulse width or low width and stored in the appropriate
variable.
**************************************************************************** */
void TimerB0Int(void)
{
if (mr3_tb0mr ==1)
// check for timer overflow
{ tb0mr = B0TIME_CONFIG; // if so clear flag and
return;
// data invaild, so leave
}
if (p9_0== 1)
widthlow = tb0 ; // if input now hi, just measured a low width
else
width_hi = tb0;
}
AN-DECE-MCU-6-A
May 2002
8
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