SN8F5708 datasheet(80/204 Pages) SONIX

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SN8F5708 Series

Timer 0 and Timer 1

Datasheet Rev. 2.4

14 Timer 0 and Timer 1

Timer 0 and Timer 1 are two independent binary up timers. Timer 0 has four different operation

modes: (1) 13-bit up counting timer, (2) 16-bit up counting timer, (3) 8-bit up counting timer with

specified reload value support, and (4) separated two 8-bit up counting timer. By contrast, Timer 1

has only mode 0 to mode 2 which are same as Timer 0. Timer 0 and Timer 1 respectively support

ET0 and ET1 interrupt function.

14.1

Timer 0 and Timer 1 Clock Selection

The figures below illustrate the clock selection circuit of Timer 0 and Timer 1. Timer 0 has three

clock sources selection: fcpu, fosc, and f RTC. All clock sources can be gated (pause) by INT0 pin if

T0GATE is applied. Timer 1 clock sources selection: fcpu and fosc. All clock sources can be gated

(pause) by INT1 pin if T1GATE is applied. Overall, the major difference between the two timers is

that Timer 0 additionally supports f RTC clock source (real time counter, RTC) which is functional if

the microcontroller’s CPU clock is ‘IHRC 32 MHz with RTC’ (refer to Reset and Power-on Controller)

and an off-chip 32 kHz crystal is connected.

÷12

fcpu

fosc

fRTC

T0EXT

T0CT

T0GATE

INT0

Timer 0 clock

T0RATE

Divider

÷1 to ÷128

÷12

fcpu

fosc

T1CT

T1GATE

INT1

Timer 1 clock

T1RATE

Divider

÷1 to ÷128

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