SYNPWM datasheet(16/57 Pages) FEELING

16 / 57 page

FM8P73B

Web site: http://www.feeling-tech.com.tw

Rev1.0 Nov 20, 2013

P.16/FM8P73B

FEELING

TECHNOLOGY

2.1.8

Timer3: 8-bit Timer

The Timer3 is an 8-bit down-count timer which include latch register. Please refer to 2.3 for detail Timer

description.

2.1.8.1

T3CON (Timer3 Control Register)

Address

Name

22h (r/w)

T3CON

T3EN

T3LOAD

T3SO1

T3SO0

T3EDG

T3PS2

T3PS1

T3PS0

T3EN : TMR3 Enable/Disable

= 1, TMR3 Enable.

= 0, TMR3 Disable.

T3LOAD : Enable/Disable Latch Buffer automatically load to counter register while writing to latch register

= 1, Enable TMR3 latch buffer automatically load to counter register while writing to latch register.

= 0, Disable TMR3 latch buffer automatically load to counter register while writing to latch register.

Note: This bit is only affected after latch register written. When the timer underflows, the latch register

data will automatically load into counter register.

T3SO1:T3SO0 : TMR3clock source selection

T3SO1

T3SO0

TMR3clock source

TMCKI(IOB2)

Internal instruction clock cycle

Fosc

No function, don’t use

T3EDG : TMR3 clock edge selection. This bit works only when external clock source TMCKI (IOB2) selected.

= 1, TMR3 increased on falling edge of TMCKI pin.

= 0, TMR3 increased on rising edge of TMCKI pin.

T3PS2:T3PS0 : TMR3 Prescaler selection

T3PS2 : T3PS0

TMR3 Prescal rate

1:1

1:2

1:4

1:8

1:16

1:32

1:64

1:128

2.1.8.2

T3LA (Timer3 Latch Register)

Address

Name

24h (r/w)

T3LA

8-bit real-time timer Latch

T3LA is a Timer3 pre-set latch buffer, see 2.3 for detail description.

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