ST7LITE20F2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7LITE20F2

8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, Timers, SPI

STMicroelectronics 

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On-chip peripherals

Figure 36. PWM function

4095

Duty cycle

register

(DCRx)

Auto-reload

register

(ATR)

000

With OE=1

and OPx=0

With OE=1

and OPx=1

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

t

Note:

Figure 37. PWM signal from 0% to 100% duty cycle

fCOUNTER

ATR= FFDh

COUNTER

FFDh

FFEh

FFFh

FFDh

FFEh

DCRx=000h

DCRx=FFDh

DCRx=FFEh

FFFh

FFDh

FFEh

DCRx=000h

t

Output compare mode

To use this function, load a 12-bit value in the DCRxH and DCRxL registers.

When the 12-bit upcounter (CNTR) reaches the value stored in the DCRxH and DCRxL

registers, the CMPF bit in the PWMxCSR register is set and an interrupt request is

generated if the CMPIE bit is set.

The output compare function is only available for DCRx values other than 0 (reset value).

Break function

The break function is used to perform an emergency shutdown of the power converter.

The break function is activated by the external BREAK pin (active low). In order to use the

BREAK pin it must be previously enabled by software setting the BPEN bit in the BREAKCR

register.

When a low level is detected on the BREAK pin, the BA bit is set and the break function is

activated.

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Doc ID 8349 Rev 5

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