HT85F2270 datasheet(151/226 Pages) HOLTEK

tên linh kiện	HT85F2270

Giải thích chi tiết về linh kiện	Standard 8051 8-Bit Flash MCU

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Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

Reload Mode

Module 0 provides a Reload Mode function. In the reload function, preset values in the CRCL and

CRCH registers are loaded into the TL2 and TH2 registers. There are two kinds of Reload modes,

Mode 0 and Mode 1, which are selected by the T2R1 and T2R0 bits in the T2CON register. In

Reload Mode 0, the Reload enable is controlled by the Timer 2 overflow which is an auto reload

and a Timer 2 interrupt will take place. In Reload Mode 1, a falling edge at the T2EX input pin

will reload the data from CRCH/CRCL registers to TH2/TL2 registers. When the external reload

interrupt control bit, EXEN2, and the Timer 2 interrupt control bit, ET2, are both set high, a

Timer 2 interrupt will be generated .The following diagram illustrates the basic operation.

EXEN�

EXF�

Interrupt

Transition

Detector

TH�/TL�

Count Enable

CRCH/CRCL

ET�

T�EX

Reload �ode 1

Reload �ode 0

Reload Mode – Module 0

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