SAB80C517-M16 SIEMENS [Siemens Semiconductor Group], SAB80C517-M16 Datasheet - Page 78
SAB80C517-M16
Manufacturer Part Number
SAB80C517-M16
Description
8-Bit CMOS Single-Chip Microcontroller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.SAB80C517-M16.pdf
(323 pages)
- Current page: 78 of 323
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On-Chip Peripheral Components
7.3.1
Mode 0
Putting either timer/counter into mode 0 configures it as an 8-bit timer/counter with a divide-by-32
prescaler. Figure 7-21 shows the mode 0 operation.
In this mode, the timer register is configured as a 13-bit register. As the count rolls over from all 1’s
to all 0’s, it sets the timer overflow flag TF0. The overflow flag TF0 then can be used to request an
interrupt (see section 8 for details about the interrupt structure). The counted input is enabled to the
timer when TR0 = 1 and either GATE = 0 or INT0 = 1 (setting GATE = 1 allows the timer to be
controlled by external input INT0, to facilitate pulse width measurements). TR0 is a control bit in the
special function register TCON; GATE is in TMOD.
The 13-bit register consists of all 8 bits of TH1 and the lower 5 bits of TL0. The upper 3 bits of TL0
are indeterminate and should be ignored. Setting the run flag (TR0) does not clear the registers.
Mode 0 operation is the same for timer 0 as for timer 1. Substitute TR1, TF1, TH1, TL1, and INT1
for the corresponding timer 1 signals in figure 7-21. There are two different gate bits, one for timer 1
(TMOD.7) and one for timer 0 (TMOD.3).
Figure 7-21
Timer/Counter 0/1, Mode 0: 13 Bit Timer/Counter
Semiconductor Group
79
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