em78p5842 ELAN Microelectronics Corp, em78p5842 Datasheet - Page 32

• Manufacturer Part Number: em78p5842
• Description: 8-bit Micro-controller
• Manufacturer: ELAN Microelectronics Corp

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* This specification is subject to change without notice.
• 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.
(4) PWM Duty Cycle ( DTX: DT1H/ DT1L; DTL: DL1H/DL1L)
(5) PWM Programming Procedures/Steps
(6) Timer
The following formula describes how to calculate the PWM period:
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:
Load PRDX with the PWM period.
(1) Load DTX with the PWM Duty Cycle.
(2) Enable interrupt function by writing IOCF PAFE0, if required.
(3) Set PWMX pin to be output by writing a desired value to IOCC PAGE0.
Timer1 (TMR1) and Timer2 (TMR2) (TMRX) are 10-bit clock counters with programmable prescalers,
respectively. This is designed for the PWM module as baud rate clock generators. TMRX can be read,
written, and cleared at any reset conditions.
The figure in the next page shows TMRX block diagram. Each signal and block are described as follows:
Where Fosc is system clock
PERIOD = (PRDX + 1) * 4 * (1/Fosc) * (TMRX prescale value )
Duty Cycle = (DTX) * (1/Fosc) * (TMRX prescale value)
Load a desired value to R5 PAGE3 with TMRX prescaler value and enable both PWMX and TMRX.
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EM785840/5841/5842
8-bit Micro-controller
2004/11/10 V1.2