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C511 Datasheet(PDF) 54 Page - Siemens Semiconductor Group

Part # C511
Description  8-Bit CMOS Microcontroller
PDF  128 Pages
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

C511 Datasheet(HTML) 54 Page - Siemens Semiconductor Group

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On-Chip Peripheral Units
Semiconductor Group
6-21
6.2.1.4 Mode 3
Mode 3 has different effects on timer 0 and timer 1. Timer 1 in mode 3 simply holds its count and
stops counting. The effect is the same as setting TR1=0. Timer 0 in mode 3 establishes TL0 and
TH0 as two seperate counters. The logic for mode 3 on timer 0 is shown in figure 6-22. TL0 uses
the timer 0 control bits: C/T, Gate, TR0, INT0 and TF0. TH0 is locked into a timer function (counting
machine cycles) and takes over the use of TR1 and TF1 from timer 1. Thus, TH0 now controls the
"timer 1" interrupt.
Mode 3 is provided for applications requiring an extra 8-bit timer or counter. When timer 0 is in
mode 3, timer 1 can be turned on and off by switching it out of and into its own mode 3, or can still
be used by the serial channel as a baud rate generator, or in fact, in any application not requiring
an interrupt from timer 1 itself.
Figure 6-22
Timer/Counter 0, Mode 3: Two 8-Bit Timers/Counters
MCS02096
1
&
OSC
C/T = 0
TL0
TF0
C/T = 1
(8 Bits)
TR1
Gate
P3.2/INT0
Control
Interrupt
(8 Bits)
TH0
Interrupt
TF1
Control
TR1
/12
f OSC
OSC
f
/12
P3.4/T0
÷ 12
=1
< _



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