SAB80515 Datasheet, PDF (66/270 Pages) Siemens Semiconductor Group – 8-Bit Single-Chip Microcontroller Family

On-Chip Peripheral Components
Figure 7-19
Special Function Register TCON (Address 88H)
8FH 8EH 8DH 8CH 8BH 8AH 89H 88H
88H TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 TCON
These bits are not used in controlling timer/counter 0 and 1.
Bit
Function
TR0
Timer 0 run control bit.
Set/cleared by software to turn timer/counter 0 ON/OFF.
TF0
Timer 0 overflow flag. Set by hardware on timer/counter overflow.
Cleared by hardware when processor vectors to interrupt routine.
TR1
Timer 1 run control bit.
Set/cleared by software to turn timer/counter 1 ON/OFF.
TF1
Timer 1 overflow flag. Set by hardware on timer/counter overflow.
Cleared by hardware when processor vectors to interrupt routine.
Each timer consists of two 8-bit registers (TH0 and TL0 for timer/counter 0, TH1 and TL1 for timer/
counter 1) which may be combined to one timer configuration depending on the mode that is
established. The functions of the timers are controlled by two special function registers TCON and
TMOD, shown in figures 7-19 and 7-20.
In the following descriptions the symbols TH0 and TL0 are used specify the high-byte and low-byte
of timer 0 (TH1 and TL1 for timer 1, respectively). The operating modes are described and shown
for timer 0. If not explicitly noted, this applies also to timer 1.
Semiconductor Group
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