Jump, Loop, and Call Instructions

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Jump, Loop, and Call Instructions WEEK 2 Jump, Loop, and Call Instructions ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers I/O Port Programming ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers Peripherals Know the device peripheral parameters Resolution of data Frequency of measurement Understand the interface issues ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

ET2640 Microprocessors and Microcontrollers

COUNTER/TIMER PROGRAMMING IN THE 8051 ET2460 Microcomputers and Microprocessors

Outlines List the timers of the 8051 and their associated registers Describe the various modes of the 8051 timers Program the 8051 timers to generate time delays Program the 8051 counters as event counters

PROGRAMMING 8051 TIMERS Timer 0 registers TL0 ( timer 0 low byte ) TH0 ( timer 0 high byte )

Timer 1 registers TL1 ( timer 1 low byte ) TH1 ( timer 1 high byte )

TMOD (timer mode) register

Find the timer’s clock frequency and its period for various 8051-based systems, with the following crystal frequencies: 12 mHz 16 mHz 11..592 mhz

ET2640 Microprocessors and Microcontrollers Oscillator/Clock ET2640 Microprocessors and Microcontrollers

Example: Find the value for TMOD if we want to program timer 0 IN MODE 2 USE THE 8051 XTAL for the clock source, and use instructions to start and stop the timer TMOD-0000 0010 ;Timer 0, mode 2 C/T=0 to use XTAL clock source, and Gate-0 to use internal software Start and atop method.

Mode 1 programming 1.Loaded value into TL and TH 2.”SETB TR0” for timer 0 ;”SETB TR1” for timer 1 3.If TF (timer flag) = high “CLR TR0” or “CLR TR1” 4.Reloaded TH and TL value, TF reset to 0

Steps to program in mode 1 1.Load the TMOD value 2.Load registers TL and TH 3.Start the timer (SETB TR0 or SETB TR1) 4.Keep monitoring the timer flag (TF) 5.Stop the timer (CLR TR0 or CLR TR1) 6.Clear the TF flag 7.Go back to step 2

Calculate Timer Delay

Finding values to be loaded into the timer Assuming XTAL =11.0592MHz from Example 9-10 1.Divide the desired time delay by 1.085μs 2.Perform 65536-n, where n is the decimal value we got in Step 1 3.Convert the result of Step 2 to hex, where yyxx is the initial hex value to be loaded into the timer’s registers 4.Set TL = xx and TH = yy

Mode 0 Mode 2 Programming Like mode 1 except that it is a 13-bit timer 1.Loaded value into TH (8-bit timer) 2.”SETB TR0” for timer 0 ;”SETB TR1” for timer 1 3.If TF (timer flag) = high “CLR TR0” or “CLR TR1” 4.Reloaded TL value kept by TH

Steps to program in Mode 2 1.Load the TMOD value 2.Load the TH registers 3.Start the timer 4.Keep monitoring the timer flag (TF) 5.Clear the TF flag 7.Go back to step 4

C/T bit in TMOD register

The case of GATE =1 in TMOD