STC89LE53RC datasheet(95/165 Pages) STC

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7.2 Timer/Counter 1 Mode of Operation

Mode 0

In this mode, the timer register is configured as a 13-bit register. As the count rolls over from all 1s to all 0s, it

sets the timer interrupt flag TF1. The counted input is enabled to the timer when TR1 = 1 and either GATE=0 or

INT1 = 1.(Setting GATE = 1 allows the Timer to be controlled by external input INT1 , to facilitate pulse width

measurements.) TR0 is a control bit in the Special Function Register TCON. GATE is in TMOD.

The 13-Bit register consists of all 8 bits of TH1 and the lower 5 bits of TL1. The upper 3 bits of TL1 are

indeterminate and should be ignored. Setting the run flag (TR1) does not clear the registers.

Mode 1

In this mode, the timer register is configured as a 16-bit register. As the count rolls over from all 1s to all 0s, it

sets the timer interrupt flag TF1. The counted input is enabled to the timer when TR1 = 1 and either GATE=0 or

INT1 = 1.(Setting GATE = 1 allows the Timer to be controlled by external input INT1 , to facilitate pulse width

measurements.) TRl is a control bit in the Special Function Register TCON. GATE is in TMOD.

The 16-Bit register consists of all 8 bits of THl and the lower 8 bits of TL1. Setting the run flag (TR1) does not

clear the registers.

Mode 1 is the same as Mode 0, except that the timer register is being run with all 16 bits.

Interrupt

SYSclk

TL1

(8 Bits)

TH1

(8 bits)

TF1

control

C/T=0

C/T=1

T1 Pin

TR1

GATE

INT1

MCU in 12T mode

÷12

÷6

MCU in 6T mode

Timer/Counter 1 Mode 1 : 16-Bit Counter

Interrupt

SYSclk

TL1

(5 Bits)

TH1

(8 bits)

TF1

control

C/T=0

C/T=1

T1 Pin

TR1

GATE

INT1

MCU in 12T mode

÷12

÷6

MCU in 6T mode

Timer/Counter 1 Mode 0: 13-Bit Counter

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