C167CS datasheet(320/517 Pages) INFINEON

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C167CS

Derivatives

The Capture/Compare Units

User’s Manual

16-2

V2.0, 2000-07

From the programmer’s point of view, the term ‘CAPCOM unit’ refers to a set of SFRs

which are associated with this peripheral, including the port pins which may be used for

alternate input/output functions including their direction control bits.

A CAPCOM unit is typically used to handle high speed IO tasks such as pulse and

waveform generation, pulse width modulation, or recording of the time at which specific

events occur. It also allows the implementation of up to 16 software timers. The

maximum resolution of the CAPCOM units is 8 CPU clock cycles (= 16 TCL).

Each CAPCOM unit consists of two 16-bit timers (T0/T1 in CAPCOM1, T7/T8 in

CAPCOM2), each with its own reload register (TxREL), and a bank of sixteen dual

purpose 16-bit capture/compare registers (CC0 through CC15 in CAPCOM1, CC16

through CC31 in CAPCOM2).

The input clock for the CAPCOM timers is programmable to several prescaled values of

the CPU clock, or it can be derived from an overflow/underflow of timer T6 in block

GPT2. T0 and T7 may also operate in counter mode (from an external input) where they

can be clocked by external events.

Each capture/compare register may be programmed individually for capture or compare

function, and each register may be allocated to either timer of the associated unit. All

capture/compare registers of each module have one port pin associated with it,

respectively, which serves as an input pin for the capture function or as an output pin for

the compare function. The capture function causes the current timer contents to be

latched into the respective capture/compare register triggered by an event (transition) on

its associated port pin. The compare function may cause an output signal transition on

that port pin whose associated capture/compare register matches the current timer

contents. Specific interrupt requests are generated upon each capture/compare event

or upon timer overflow.

Figure 16-2 shows the basic structure of the two CAPCOM units.

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