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P89C51UFBB

80C51 8-bit microcontroller family 4K/8K/16K/32K Flash

Philips Electronics 

Philips Semiconductors

80C51 8-bit microcontroller family

4K/8K/16K/32K Flash

Product specification

89C51/89C52/89C54/89C58

OSC

÷ 12

T2 PIN

C/T2 = 0

C/T2 = 1

TRANSITION

DETECTOR

CONTROL

TR2 RELOAD

TL2

(8-BITS)

TH2

(8-BITS)

RCAP2L

RCAP2H

T2EX PIN

CONTROL

EXEN2

Figure 4. Timer 2 in Auto-Reload Mode (DCEN = 0)

(DOWN COUNTING RELOAD VALUE)

FFH

FFH

TF2

EXF2

TIMER 2

INTERRUPT

SU00067

TOGGLE

EXF2

OSC

÷12

C/T2 = 0

T2 PIN

C/T2 = 1

OVERFLOW

TL2

TH2

TF2

CONTROL

TR2

RCAP2L

RCAP2H

(UP COUNTING RELOAD VALUE)

Figure 5. Timer 2 Auto Reload Mode (DCEN = 1)

COUNT

DIRECTION

1 = UP

0 = DOWN

T2EX PIN

INTERRUPT

SU00730

1999 Oct 27

11

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