AT89LV55_06 datasheet(10/32 Pages) ATMEL

Part #	AT89LV55

Description	8-bit Microcontroller with 20K Bytes Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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0811D–MICRO–3/06

AT89LV55

A logic 0 at T2EX makes Timer 2 count down. The timer underflows when TH2 and TL2 equal

the values stored in RCAP2H and RCAP2L. The underflow sets the TF2 bit and causes 0FFFFH

to be reloaded into the timer registers.

The EXF2 bit toggles whenever Timer 2 overflows or underflows and can be used as a 17th bit

of resolution. In this operating mode, EXF2 does not flag an interrupt.

Figure 8-2.

Timer 2 Auto Reload Mode (DCEN = 0)

Table 8-2.

T2MOD—Timer 2 Mode Control Register

T2MOD Address = 0C9H

Reset Value = XXXX XX00B

Not Bit Addressable

––

––––

T20E

DCEN

Bit

7

6

5432

10

Symbol

Function

–

Not implemented, reserved for future use.

T20E

Timer 2 Output Enable bit.

DCEN

When set, this bit allows Timer 2 to be configured as an up/down counter.

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