AT89LP51 datasheet(49/113 Pages) ATMEL

49 / 113 page

3709B–MICRO–12/10

AT89LP51/52 - Preliminary

Figure 11-5. Timer 0/1 Toggle Mode 2 Waveform

THx

FFh

Table 11-4.

TMOD – Timer/Counter Mode Control Register

TMOD Address = 089H

Reset Value = 0000 0000B

Not Bit Addressable

GATE1

C/T1

T1M1

T1M0

GATE0

C/T0

T0M0

T0M1

Bit

765

210

Symbol

Function

GATE1

Timer 1 Gating Control. When set, Timer/Counter 1 is enabled only while INT1 pin is high and TR1 control pin is set.

When cleared, Timer 1 is enabled whenever TR1 control bit isset.

C/T1

Timer or Counter Selector 1. Cleared for Timer operation (input from internal system clock). Set for Counter operation

(input from T1 input pin). C/T1 must be zero when using Timer 1 in Clock Out mode.

T1M1

T1M0

Timer 1 Operating Mode

Mode

T1M1

T1M0

Operation

00013-bit Timer Mode. 8-bit Timer/Counter TH1 with TL1 as 5-bit prescaler.

10116-bit Timer Mode. TH1 and TL1 are cascaded to form a 16-bit Timer/Counter.

210

8-bit Auto Reload Mode. TH1 holds a value which is reloaded into 8-bit Timer/Counter

TL1 each time it overflows.

311Timer/Counter 1 is stopped

GATE0

Timer 0 Gating Control. When set, Timer/Counter 0 is enabled only while INT0 pin is high and TR0 control pin is set.

When cleared, Timer 0 is enabled whenever TR0 control bit isset.

C/T0

Timer or Counter Selector 0. Cleared for Timer operation (input from internal system clock). Set for Counter operation

(input from T0 input pin). C/T0 must be zero when using Timer 0 in Clock Out mode.

T0M1

T0M0

Timer 0 Operating Mode

Mode

T0M1

T0M0

Operation

00013-bit Timer Mode. 8-bit Timer/Counter TH0 with TL0 as 5-bit prescaler.

10116-bit Timer Mode. TH0 and TL0 are cascaded to form a 16-bit Timer/Counter.

210

8-bit Auto Reload Mode. TH0 holds a value which is reloaded into 8-bit Timer/Counter

TL0 each time it overflows.

311

Split Timer Mode. 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.

AT89LP51 датащи(PDF) 49 Page - ATMEL Corporation

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