MSM80C154S/83C154S/85C154HVS884.5.2.5.5 Mode 3M1 M01 1In mode 3, timer/counter 0 TL0 and TH0 become independent 8-bit timer/counters by thecircuit connection shown in Figure 4-17. Timer/counter 1 does not operate when mode 3 isset. The TL0 8-bit timer/counter is controlled in the same way as the regular timer/counter 0,TF0 being set if a carry signal is generated by TL0.The TH0 8-bit timer/counter is controlled only by TR1, and the control only covers countstarting and stopping. TF1 is set by a carry signal generated by TH0.When timer/counter 0 is set to mode 3, timer/counter 1 can operate in modes 0, 1, or 2, andbe used by the serial port clock. Control of timer/counter 1 count starting and stopping in thiscase is handled between operating mode and mode 3. If mode 3 is set, the timer/counter 1counting operation is stopped.DETECTORXTAL 1 ÷12 S3GATEC/ TDATAINT0 PIN(PORT 3.2) LATCHS5 QTR0T0 PIN(PORT 3.4)Q0------Q7TL0(8BITS)CDETECTOR TF0XTAL 1 ÷12Q0------Q7TH0(8BITS)DETECTOR TF1TR1Figure 4-17 Timer/counter 0 mode 3
