C515A_9708 Datasheet, PDF (73/182 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C515A
6.2.2
Timer/Counter 2 with Additional Compare/Capture/Reload
The timer 2 with additional compare/capture/reload features is one of the most powerful peripheral
units of the C515A. lt can be used for all kinds of digital signal generation and event capturing like
pulse generation, pulse width modulation, pulse width measuring etc.
Timer 2 is designed to support various automotive control applications (ignition/injection-control,
anti-lock-brake ... ) as weil as industrial applications (DC-, three-phase AC- and stepper-motor
control, frequency generation, digital-to-analog conversion, process control ...). Please note that
this timer is not equivalent to timer 2 of the C501.
The C515A timer 2 in combination with the compare/capture/reload registers allows the following
operating modes:
– Compare : up to 4 PWM signals with 65535 steps at maximum, and 500 ns resolution
– Capture : up to 4 high speed capture inputs with 500 ns resolution
– Reload : modulation of timer 2 cycle time
The block diagram in figure 6-13 shows the general configuration of timer 2 with the additional
compare/capture/reload registers. The I/O pins which can used for timer 2 control are located as
multifunctional port functions at port 1 (see table 6-3).
Table 6-3
Alternate Port Functions of Timer 2
Pin Symbol
P1.0 / INT3 / CC0
P1.1 / INT4 / CC1
P1.2 / INT5 / CC2
P1.3 / INT6 / CC3
P1.5 / T2EX
P1.7 / T2
Function
Compare output / capture input for CRC register
Compare output / capture input for CC register 1
Compare output / capture input for CC register 2
Compare output / capture input for CC register 3
External reload trigger input
External count or gate input to timer 2
Semiconductor Group
6-22
1997-08-01