STC89LE53RC datasheet(93/165 Pages) STC

93 / 165 page

Mode 3

Timer 1 in Mode 3 simply holds its count, the effect is the same as setting TR1 = 0. Timer 0 in Mode 3 established

TL0 and TH0 as two separate 8-bit counters. TL0 use the Timer 0 control bits: C/T ,GATE,TR0, INT0 and TF0.

TH0 is locked into a timer function (counting machine cycles) and takes over the use of TR1 from Tmer 1. Thus,

TH0 now controls the “Timer 1” interrupt.

Mode 3 is provided for applications requiring an extra 8-bit timer or counter. When Timer 0 is in Mode 3, Timer 1

can be turned on and off by switching it out of and into its own Mode 3, or can still be used by the serial port as a

baud rate generator, or in fact, in any application not requiring an interrupt.

Interrupt

SYSclk

TF0

control

C/T=0

C/T=1

T0 Pin

TR0

GATE

INT0

MCU in 12T mode

MCU in 6T mode

TL0

(8 bit)

control

TH0

(8 Bits)

TF1

Interrupt

TR1

Timer/Counter 0 Mode 3: Two 8-Bit Counters

÷12

÷6

SYSclk

÷12

÷6

MCU in 12T mode

MCU in 6T mode

Mode 2

Mode 2 configures the timer register as an 8-bit counter(TL0) with automatic reload. Overflow from TL0 not

only set TF0, but also reload TL0 with the content of TH0, which is preset by software. The reload leaves TH0

unchanged. Mode 2 operation is the same for Timer 0 and Timer 1.

SYSclk

control

C/T=0

C/T=1

T0 Pin

TR0

GATE

INT0

MCU in 12T mode

MCU in 6T mode

TL0

(8 Bits)

TH0

(8 Bits)

Timer/Counter 0 Mode 2: 8-Bit Auto-Reload

÷12

÷6

Interrupt

TF0

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