Rainbow-electronics AT89S52 Manual de usuario descargar pdf (Pagina 8)

AT89C52

Figure 2. Timer 2 Auto Reload Mode (DCEN = 0)

Table 4. T2MOD – Timer 2 Mode Control Register

T2MOD Address = 0C9H Reset Value = XXXX XX00B

Not Bit Addressable

––––––T2OE DCEN

Bit76543210

Symbol Function

– Not implemented, reserved for future

T2OE Timer 2 Output Enable bit.

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

OSC

EXF2

TF2

T2EX PIN

T2 PIN

TR2

EXEN2

C/T2 = 0

C/T2 = 1

CONTROL

RELOAD

OVERFLOW

CONTROL

TRANSITION

DETECTOR

TIMER 2

INTERRUPT

÷12

RCAP2LRCAP2H

TH2 TL2

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 23 24

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Rainbow-electronics AT89S52 Manual de usuario Pagina 8