Rainbow-electronics AT89C51SND1C Manual de usuario descargar pdf (Pagina 56)

AT8xC51SND1C

4109E–8051–06/03

Registers Table 60. TCON Register

TCON (S:88h) – Timer/Counter Control Register

Reset Value = 0000 0000b

76543210

TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0

Bit

Number

Bit

Mnemonic Description

7TF1

Timer 1 Overflow Flag

Cleared by hardware when processor vectors to interrupt routine.

Set by hardware on Timer/Counter overflow, when Timer 1 register overflows.

6TR1

Timer 1 Run Control Bit

Clear to turn off Timer/Counter 1.

Set to turn on Timer/Counter 1.

5TF0

Timer 0 Overflow Flag

Cleared by hardware when processor vectors to interrupt routine.

Set by hardware on Timer/Counter overflow, when Timer 0 register overflows.

4TR0

Timer 0 Run Control Bit

Clear to turn off Timer/Counter 0.

Set to turn on Timer/Counter 0.

3IE1

Interrupt 1 Edge Flag

Cleared by hardware when interrupt is processed if edge-triggered (see IT1).

Set by hardware when external interrupt is detected on INT1

pin.

2IT1

Interrupt 1 Type Control Bit

Clear to select low level active (level triggered) for external interrupt 1 (INT1

Set to select falling edge active (edge triggered) for external interrupt 1.

1IE0

Interrupt 0 Edge Flag

Cleared by hardware when interrupt is processed if edge-triggered (see IT0).

Set by hardware when external interrupt is detected on

INT0 pin.

0IT0

Interrupt 0 Type Control Bit

Clear to select low level active (level triggered) for external interrupt 0 (INT0

Set to select falling edge active (edge triggered) for external interrupt 0.

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 209 210

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