AT89LS52-16AI datasheet(17/40 Pages) ATMEL

номер детали	AT89LS52-16AI

подробное описание детали	8-bit Low-Voltage Microcontroller with 8K Bytes In-System Programmable Flash

PDF	40 Pages

Scroll/Zoom	100%

производитель	ATMEL [ATMEL Corporation]

домашняя страница	http://www.atmel.com

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2601B–MICRO–03/05

AT89LS52

Figure 11-1. Timer 2 in Clock-Out Mode

12. Programmable Clock Out

A 50% duty cycle clock can be programmed to come out on P1.0, as shown in Figure 11-1. This

pin, besides being a regular I/O pin, has two alternate functions. It can be programmed to input

the external clock for Timer/Counter 2 or to output a 50% duty cycle clock ranging from 61 Hz to

4 MHz (for a 16 MHz operating frequency).

To configure the Timer/Counter 2 as a clock generator, bit C/T2 (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 the following equation.

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

when Timer 2 is used as a baud-rate generator. It is possible to use Timer 2 as a baud-rate gen-

erator and a clock generator simultaneously. Note, however, that the baud-rate and clock-out

frequencies cannot be determined independently from one another since they both use

RCAP2H and RCAP2L.

OSC

EXF2

P1.0

(T2)

P1.1

(T2EX)

TR2

EXEN2

C/T2 BIT

TRANSITION

DETECTOR

TIMER 2

INTERRUPT

T2OE (T2MOD.1)

÷2

TL2

(8-BITS)

RCAP2L RCAP2H

TH2

(8-BITS)

÷2

Clock-Out Frequency

Oscillator Frequency

4 x [65536-(RCAP2H,RCAP2L)]

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