The 8051 Microcontroller and Embedded

Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

HANEL

COUNTER PROGRAMMINGC/T Bit in TMOD Register(cont’)

TR

TH

TL

C/T = 1

TF

TF goes high when FFFF

Overflow flag →^0

Timer external input pin 3.4 or 3.5

TR

TL TH

C/T = 1

TF TF goes high when FF

→^0

Overflow flag

Reload

Timer with external input (Mode 1)Timer with external input (Mode 2)Timer external input pin 3.4 or 3.5