Rainbow-electronics AT89S53 Manual do Utilizador descarregar pdf (Página 12)

AT89S53

12

Figure 3. Timer 2 Auto Reload Mode (DCEN = 1)

Figure 4. Timer 2 in Baud Rate Generator Mode

OSC

SMOD1

RCLK

TCLK

Rx

CLOCK

Tx

CLOCK

T2EX PIN

T2 PIN

TR2

CONTROL

"1"

"1"

"1"

"0"

"0"

"0"

TIMER 1 OVERFLOW

NOTE: OSC. FREQ. IS DIVIDED BY 2, NOT 12

TIMER 2

INTERRUPT

2

2

16

16

RCAP2LRCAP2H

TH2 TL2

C/T2 = 0

C/T2 = 1

EXF2

CONTROL

TRANSITION

DETECTOR

EXEN2

÷

÷

÷

÷

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 32 33

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