SYNPWM datasheet(15/57 Pages) FEELING

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FM8P73B

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

Rev1.0 Nov 20, 2013

P.15/FM8P73B

FEELING

TECHNOLOGY

2.1.7

Timer2: 8-bit Timer & PWM1 Duty

The Timer2 is an 8-bit down-count timer which include latch register. Please refer to 2.3 for detail Timer

description.

2.1.7.1

T2CON (Timer2 Control Register)

Address

Name

0Fh (r/w)

T2CON

T2EN

T2LOAD

T2SO1

T2SO0

T2EDG

T2PS2

T2PS1

T2PS0

T2EN : TMR2 Enable/Disable

= 1, TMR2 (PWM1) Enable.

= 0, TMR2 (PWM1) Disable.

Note: At PWM mode, Timer2 is controlled by T1EN.

T2LOAD : Enable/Disable Latch Buffer automatically load to counter register while writing to latch register

= 1, Enable TMR2 latch buffer automatically load to counter register while writing to latch register.

= 0, Disable TMR2 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.

T2SO1:T2SO0 : TMR2 clock source selection

T2SO1

T2SO0

TMR2 clock source

TMCKI(IOB2)

Internal instruction clock cycle

Fosc

Fosc*2

T2EDG : TMR2 clock edge selection. This bit works only when external clock source TMCKI (IOB2) selected.

= 0, TMR2 increased on rising edge of TMCKI pin.

= 1, TMR2 increased on falling edge of TMCKI pin.

T2PS2:T2PS0 : TMR2 Prescaler selection

T2PS2 : T2PS0

TMR2 Prescal rate

1:1

1:2

1:4

1:8

1:16

1:32

1:64

1:128

2.1.7.2

T2LA (Timer2 Latch Register)

Address

Name

10h (r/w)

T2LA

8-bit real-time timer Latch

T2LA is a Timer2 pre-set latch buffer, see 2.3 for detail description.

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