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| 型號： | PULSE |
| 英文描述： | Pulse Period/Width Measurement on the M16C/62 |
| 中文描述： | 脈沖持續(xù)時間/寬度測量的雙隨機PWM |
| 文件頁數(shù)： | 10/13頁 |
| 文件大小： | 410K |
| 代理商： | PULSE |
Pulse Period/Width Measurement on the M16C/62
M16C
/*****************************************************************************
Name: main()
Parameters: none
Returns: nothing
Description: initializes variables. Then the variable 'period' is constantly
updated with the period count in timer TB1. This is to illustrate
that the period measurement is free running. Note that the first
few times TB1 is read, the data may not be valid.
*****************************************************************************/
void main (void)
{
init();
while (1)
{
period = tb1 ;
// period measured in polled mode
}
}
/*****************************************************************************
Name: initial()
Parameters: none
Returns: nothing
Description: Timer TB0 setup for pulse width interrupts and TB1 configured for
pulse period measurement (no interrupts).
**************************************************************************** */
void init()
{
/* the following procedure for writing an Interrupt Priority Level follows that as
described in the M16C
data sheets under 'Interrupts' */
_asm (" fclr i") ;
// turn off interrupts before modifying IPL
tb0ic |= CNTR_IPL; // use read-modify-write instruction to write IPL
tb0mr = B0TIME_CONFIG;
_asm (" fset i");
tb0s = 1; //start counting
tb1mr = B1TIME_CONFIG;
tb1s = 1; //start counting
}
AN-DECE-MCU-6-A
May 2002
9
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