AT89C51CC02CA-RATUM datasheet(59/156 Pages) ATMEL

59 / 156 page

AT/T89C51CC02

4126J–CAN–05/06

Figure 26. Timer/Counter x (x= 0 or 1) in Mode 2

Mode 3 (Two 8-bit Timers)

Mode 3 configures Timer 0 such that registers TL0 and TH0 operate as separate 8-bit

Timers (See Figure 27). This mode is provided for applications requiring an additional 8-

bit Timer or Counter. TL0 uses the Timer 0 control bits C/T0# and GATE0 in TMOD reg-

ister, and TR0 and TF0 in TCON register in the normal manner. TH0 is locked into a

Timer function (counting FPER /6) and takes over use of the Timer 1 interrupt (TF1) and

run control (TR1) bits. Thus, operation of Timer 1 is restricted when Timer 0 is in mode

Figure 27. Timer/Counter 0 in Mode 3: Two 8-bit Counters

Timer 1

Timer 1 is identical to Timer 0 excepted for Mode 3 which is a hold-count mode. Follow-

ing comments help to understand the differences:

•

Timer 1 functions as either a Timer or event Counter in three modes of operation.

Figure 24 to Figure 26 show the logical configuration for modes 0, 1, and 2. Timer

1’s mode 3 is a hold-count mode.

•

Timer 1 is controlled by the four high-order bits of TMOD register (See Figure 39)

and bits 2, 3, 6 and 7 of TCON register (See Figure 38). TMOD register selects the

method of Timer gating (GATE1), Timer or Counter operation (C/T1#) and mode of

operation (M11 and M01). TCON register provides Timer 1 control functions:

overflow flag (TF1), run control bit (TR1), interrupt flag (IE1) and interrupt type

control bit (IT1).

•

Timer 1 can serve as the Baud Rate Generator for the Serial Port. Mode 2 is best

suited for this purpose.

TRx

TCON Reg

TFx

TCON Reg

GATEx

TMOD Reg

Overflow

Timer x

Interrupt

Request

C/Tx#

TMOD Reg

TLx

(8 bits)

THx

(8 bits)

INTx#

FTx

CLOCK

÷ 6

See section “Clock”

TR0

TCON.4

TF0

TCON.5

INT0#

GATE0

TMOD.3

Overflow

Timer 0

Interrupt

Request

C/T0#

TMOD.2

TL0

(8 bits)

TR1

TCON.6

TH0

(8 bits)

TF1

TCON.7

Overflow

Timer 1

Interrupt

Request

FTx

CLOCK

÷ 6

FTx

CLOCK

÷ 6

See section “Clock”

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