C511_1 Datasheet, PDF (53/128 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Units
6.2.1.3 Mode 2
Mode 2 configures the timer register as an 8-bit counter (TL0) with automatic reload, as shown in
figure 6-21. Overflow from TL0 not only sets TF0, but also reloads TL0 with the contents of TH0,
which is preset by software. The reload leaves TH0 unchanged.
Mode 2 operation is the same for timer 0 as for timer 1. Substitute TR0, TF0, TH0, TL0 and INT0
for the corresponding timer 1 signals in figure 6-21. There are two different gate bits, one for timer
1 (TMOD.7) and one for timer 0 (TMOD.3).
Figure 6-21
Timer/Counter 0, Mode 2: 8-Bit Timer/Counter with Auto-Reload
Semiconductor Group
6-20