SN8F5708 datasheet(90/204 Pages) SONIX

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SN8F5708 Series

Timer 2

Datasheet Rev. 2.4

÷24

fcpu

T2PS

T2I[1:0]

÷12

16-bit Counter/Timer

TH2/TL2

TF2

15.2

Specified Timer 2 Reload Value

The specified reload value is an optional function which can reload Timer 2 counter by overflow or

external control pin.

If overflow-to-reload is selected, Timer 2 duplicates CRCH/CRCL value to its counter (TH2/TL2)

automatically by overflow signal. As a result, Timer 2 would repeatedly counts from CRCH/CRCL

value to 0xFFFF.

On the other hand, a falling edge of external pin T2RL (shared with P2.2) can also be chosen as a

reload signal. In this situation, Timer 2 normally counts its counter from 0x0000 to 0xFFFF if T2RL

pin remains stable, yet the counter value would be replaced at any time by CRCH/CRCL value as

long as T2RL pin has a falling signal. Subsequently, Timer 2 continues its counting routine from

CRCH/CRCL value, and external reload flag (TF2RL) would be issued if interrupt function is enabled

(both ET2RL and ET2 are set). External reload interrupt vector is shared with Timer 2 interrupt

vector and identify event by firmware.

16-bit Counter/Timer

TH2/TL2

Timer 2 clock

CRCH/CRCL

Reload

TF2

T2RL

TF2RL

T2R[1:0]

ET2RL

T2R[1:0] = 11

SN8F5708 Datasheet(PDF) 90 Page - SONiX Technology Company