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ST10F269Z2QX データシート(PDF) 48 Page - STMicroelectronics |
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ST10F269Z2QX データシート(HTML) 48 Page - STMicroelectronics |
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48 / 161 page  ST10F269Z2Qx 48/161 9 - CAPTURE/COMPARE (CAPCOM) UNITS The ST10F269Z2Qx has two 16 channels CAPCOM units as described in Figure 12. These support generation and control of timing sequences on up to 32 channels with a maximum resolution of 200ns at 40MHz CPU clock. The CAPCOM units are typically used to handle high speed I/O tasks such as pulse and waveform generation, pulse width modulation (PMW), Digital to Analog (D/A) conversion, software timing, or time recording relative to external events. Four 16-bit timers (T0/T1, T7/T8) with reload registers provide two independent time bases for the capture/compare register array (See Figures 13 and 14). The input clock for the timers is programmable to several prescaled values of the internal system clock, or may be derived from an overflow/ underflow of timer T6 in module GPT2. This provides a wide range of variation for the timer period and resolution and allows precise adjustments to application specific requirements. In addition, external count inputs for CAPCOM timers T0 and T7 allow event scheduling for the capture/compare registers relative to external events. Each of the two capture/compare register arrays contain 16 dual purpose capture/compare registers, each of which may be individually allocated to either CAPCOM timer T0 or T1 (T7 or T8, respectively), and programmed for capture or compare functions. Each of the 32 registers has one associated port pin which serves as an input pin for triggering the capture function, or as an output pin to indicate the occurrence of a compare event. Figure 12 shows the basic structure of the two CAPCOM units. * The CAPCOM2 unit provides 16 capture inputs, but only 12 compare outputs. CC24I to CC27I are inputs only. Figure 12 : CAPCOM Unit Block Diagram Pin Tx Input Control 2n n = 3...10 GPT2 Timer T6 Pin TxIN CPU Clock Mode Control (Capture or Compare) 16 Capture inputs Compare outputs Pin Ty Input Control 2n n = 3...10 GPT2 Timer T6 Over / Underflow CPU Clock Reload Register TxREL CAPCOM Timer Tx Interrupt Request Sixteen 16-bit (Capture/Compare) Registers Over / Underflow CAPCOM Timer Ty Reload Register TyREL 16 Capture / Compare* Interrupt Requests Interrupt Request x = 0, 7 y = 1, 8 |
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