C515 datasheet(28/55 Pages) INFINEON

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C515

Semiconductor Group

1997-08-01

Timer 2 Compare Modes

The compare function of a timer/register combination operates as follows : the 16-bit value stored

in a compare or compare/capture register is compared with the contents of the timer register; if the

count value in the timer register matches the stored value, an appropriate output signal is generated

at a corresponding port pin and an interrupt can be generated.

Compare Mode 0

In compare mode 0, upon matching the timer and compare register contents, the output signal

changes from low to high. lt goes back to a low level on timer overflow. As long as compare mode

0 is enabled, the appropriate output pin is controlled by the timer circuit only and writing to the port

will have no effect. Figure 11 shows a functional diagram of a port circuit when used in compare

mode 0. The port latch is directly controlled by the timer overflow and compare match signals. The

input line from the internal bus and the write-to-latch line of the port latch are disconnected when

compare mode 0 is enabled.

Figure 11

Port Latch in Compare Mode 0

MCS02661

Latch

Port

CLK

Port

Read Pin

Read Latch

Port Circuit

Internal

Bus

Latch

Write to

Compare Reg.

Compare Register

Circuit

Comparator

Timer Register

Timer Circuit

Compare

Match

Overflow

Timer

16 Bit

Bit

C515 Datasheet(PDF) 28 Page - Infineon Technologies AG

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