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| 型号： | EM78459 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 14-SOIC |
| 中文描述： | 8位微控制器的通用产品 |
| 文件页数： | 31/57页 |
| 文件大小： | 854K |
| 代理商： | EM78459 |
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EM78458/459
MASK ROM
This specification is subject to change without prior notice.
2002/03/01
37
3. PWM Period ( PRDX : PRD1 or PRD2 )
The PWM period is defined by writing to the PRDX register. When TMRX is equal to PRDX, the
following events occur on the next increment cycle:
TMRX is cleared.
The PWMX pin is set to 1.
The PWM duty cycle is latched from DT1/DT2 to DTL1/DTL2.
< Note > The PWM output will not be set, if the duty cycle is 0;
The PWMXIF pin is set to 1.
The following formula describes how to calculate the PWM period:
PERIOD = (PRDX + 1) * 4 * (1/Fosc) * (TMRX prescale value )
4. PWM Duty Cycle ( DTX: DT1H/ DT1L and DT2H/ DT2L; DTL: DL1H/DL1L and
DL2H/DL2L )
The PWM duty cycle is defined by writing to the DTX register, and is latched from DTX to DLX while
TMRX is cleared. When DLX is equal to TMRX, the PWMX pin is cleared. DTX can be loaded at any
time. However, it cannot be latched into DTL until the current value of DLX is equal to TMRX.
The following formula describes how to calculate the PWM duty cycle:
Duty Cycle = (DTX) * (1/Fosc) * (TMRX prescale value )
5. Comparator X
To change the output status while the match occurs, the TMRXIF flag will be set at the same time.
6. PWM Programming Procedures/Steps
Load PRDX with the PWM period.
(1) Load DTX with the PWM Duty Cycle.
(2) Enable interrupt function by writing IOCF0, if required.
(3) Set PWMX pin to be output by writing a desired value to IOC60.
(4) Load a desired value to IOC51 with TMRX prescaler value and enable both PWMX and TMRX.
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