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Device Specification

Semiconductor Group 7-34

Compare/Capture Unit (CCU)

The compare/capture unit is a complex timer/register array for applications that require high

speed I/O pulse width modulation and more timer/counter capabilities.

The CCU contains

– one 16-bit timer/counter (timer2) with 2-bit prescaler, reload capability and a max. clock

frequency of f

OSC/12

(1 MHz with a 12 MHz crystal).

– one 16-bit timer (compare timer) with 8-bit prescaler, reload capability and a max. clock

frequency of f

OSC/2

(6 MHz with a 12 MHz crystal).

– fifteen 16-bit compare registers.

– five of which can be used as 16-bit capture registers.

– up to 21 output lines controlled by the CCU.

– nine interrupts which can be generated by CCU-events.

Figure 5 shows a block diagram of the CCU. Eight compare registers (CM0 to CM7) can

individually be assigned to either timer 2 or the compare timer. Diagrams of the two timers are

shown in figures 6 and 7. The four compare/capture registers, the compare/reload/capture

Table 3 illustrates possible combinations and the corresponding output lines.

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 136 137

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Siemens EF 88H Series Manual de usuario Pagina 96