AT89LP2052 datasheet(25/90 Pages) ATMEL

25 / 90 page

3547F–MICRO–6/06

AT89LP2052/LP4052

Table 15-2.

TMOD: Timer/Counter Mode Control Register

TMOD = 89H

Reset Value = 0000 0000B

Not Bit Addressable

GATE

C/T

GATE

C/T

5432

Timer1

Timer0

Gate

Gating control: when set Timer/Counter x is enabled only

while INTx pin is high and TRx control pin is set. When

cleared, Timer x is enabled whenever TRx control bit

is set.

Timer 0 gate bit

Timer 0 counter/timer select bit

C/T

Timer or Counter Selector: cleared for Timer operation

(input from internal system clock). Set for Counter

operation (input from Tx input pin).

Timer 0 M1 bit

Timer 0 M0 bit

Mode bit 1

Mode bit 0

Mode

Operating Mode

000Variable 9 - 16-bit Timer/Counter.

8-bit Timer/Counter THz with TLx as 1 - 8-bit prescaler.

16-bit Auto Reload Timer/Counter.

8-bit Timer/Counters THx and TLx are cascaded; there is no prescaler.

1028-bit Auto Reload Timer/Counter.

8-bit auto-reload Timer/Counter THx holds a value which is to be

reloaded into TLx each time it overflows.

113Split Timer/Counter.

(Timer 0) 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.

113(Timer 1) Timer/Counter 1 stopped.

Timer SFR

Purpose

Address

Bit-Addressable

TCON

Control

88H

Yes

TMOD

Mode

89H

TL0

Timer 0 low-byte

8AH

TL1

Timer 1 low-byte

8BH

TH0

Timer 0 high-byte

8CH

TH1

Timer 1 high-byte

8DH

TCONB

Mode

91H

RL0

Timer 0 reload low-byte

92H

RL1

Timer 1 reload low-byte

93H

RH0

Timer 0 reload high-byte

94H

RH1

Timer 1 reload high-byte

95H

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