SAH-C515 SIEMENS [Siemens Semiconductor Group], SAH-C515 Datasheet - Page 64
![no-image](/images/no-image-200.jpg)
SAH-C515
Manufacturer Part Number
SAH-C515
Description
8-Bit CMOS Microcontroller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.SAH-C515.pdf
(160 pages)
- Current page: 64 of 160
- Download datasheet (912Kb)
6.2.1.5
Mode 3 has different effects on timer 0 and timer 1. Timer 1 in mode 3 simply holds its count. 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 6-12. 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 6-12
Timer/Counter 0, Mode 3: Two 8-Bit Timers/Counters
Semiconductor Group
P3.2/INT0
Mode 3
f
P3.4/T0
OSC
Gate
TR1
/12
OSC
=1
÷ 12
<
_
1
TR1
C/T = 0
C/T = 1
&
6-21
f
OSC
/12
Control
Control
On-Chip Peripheral Components
(8 Bits)
(8 Bits)
TH0
TL0
TF0
TF1
Interrupt
Interrupt
MCS02096
C515
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