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2. TMOD register: Timer/Counter Mode Register

TMOD address: 89H (Non bit-addressable)

GATE

C/T

GATE

C/T

(MSB)

(LSB)

Timer 1

Timer 0

GATR/TMOD.7: Timer/Counter Gate Control.

If GATE/TMOD.7=0,Timer/Counter 1 enabled when TR1 is set irrespective of INT1 logic level;

If GATE/TMOD.7=1, Timer/Counter 1 enabled only when TR1 is set AND INT1 pin is high.

C/T/TMOD.6: Timer/Counter 1 Select bit.

If C/T/TMOD.6=0,Timer/Counter 1 is set for Timer operation (input from internal system clock);

If C/T/TMOD.6=0,Timer/Counter 1 is set for Counter operation (input from external T1 pin).

M1/TMOD.5 ~ M0/TMOD.4: Timer 1 Mode Select bits.

Operating Mode

Mode 0: 13-bit Timer/Counter for Timer 1

Mode 1: 16-bit Timer/Counter. TH1and TL1 are cascaded; there is no prescaler.

Mode 2: 8-bit auto-reload Timer/Counter. TH1 holds a value which is to be reloaded into TL1

each time it overflows.

Timer/Counter 1 stopped

GATR/TMOD.3: Timer/Counter Gate Control.

If GATE/TMOD.3=0,Timer/Counter 0 enabled when TR0 is set irrespective of INT0 logic level;

If GATE/TMOD.3=1, Timer/Counter 0 enabled only when TR0 is set AND INT0 pin is high.

C/T/TMOD.2: Timer/Counter 0 Select bit.

If C/T/TMOD.2=0,Timer/Counter 0 is set for Timer operation (input from internal system clock);

If C/T/TMOD.2=0,Timer/Counter 0 is set for Counter operation (input from external T0 pin).

M1/TMOD.1 ~ M0/TMOD.0: Timer 0 Mode Select bits.

Operating Mode

Mode 0: 13-bit Timer/Counter for Timer 0

Mode 1: 16-bit Timer/Counter. TH0 and TL0 are cascaded; there is no prescaler.

Mode 2: 8-bit auto-reload Timer/Counter. TH0 holds a value which is to be reloaded

into TL0 each time it overflows.

Mode3: TL0 is an 8-bit Timer/Counter controlled by the standard Timer 0 control bits

TH0 is an 8-bit timer only controlled by Timer 1 control bits.

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