SM89516B datasheet(32/49 Pages) SYNCMOS

32 / 49 page

SM89516B

8-Bit Micro-controller

64KB Flash

& 1KB RAM embedded

Specifications subject to change without notice contact your sales representatives for the most recent information.

ISSFD-M087

Ver D SM89516B 08/07/2015

- 32 -

C/T2=0

C/T2=1

T2 pin

TL2

TH2

TF2

Fosc/12

TR2

RCAP2L

RCAP2H

Timier2 in Auto Reload Mode

(DCEN=1)

FFH

EXF2

T2EX PIN

Count Direction

1 = UP

0 = DOWN

Timer2

interrupt

Fig. 7-3： Timer 2 in auto reload mode (DCEN=1)

7.3

Programmable clock out

A 50% duty cycle clock can be programmed to come out on P1.0. This pin, besides begin a regular I/O pin, has two

alternate functions. It can be programmed (1) to input the external clock for Timer/Counter 2 or (2) to output a 50%

duty cycle clock. An example is that the clock output ranges from 61Hz to 4MHz at a 16MHz oscillator frequency if

in 12T mode.

To configure the Timer/Counter 2 as a clock generator, bit C/

(T2CON.1) must be cleared and bit

T2OE(T2MOD.1) must be set. Bit TR2 (T2CON.2) starts and stops the timer.

The Clock-Out frequency depends on the oscillator frequency and the reload value of Timer 2 capture registers

(RCAP2H, RCAP2L) as shown in this equation:

Clock-Out Frequency =

)

65536

(

Frequency

Oscillator

RCAP

−

In the clock-out mode, Timer 2 roll-overs will not generate an interrupt. This is similar to when Timer 2 is used as a

baud-rate generator. It is possible to use Timer 2 as a baud-rate generator and a clock generator simultaneously.

Note, however, that the baud-rate and clock-out frequencies can not be determined independently from one

another since they both use RCAP2H and RCAP2L.

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