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ST10F273E Datasheet(PDF) 61 Page - STMicroelectronics |
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ST10F273E Datasheet(HTML) 61 Page - STMicroelectronics |
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61 / 179 page  ST10F273E General purpose timer unit 61/179 11.2 GPT2 The GPT2 module provides precise event control and time measurement. It includes two timers (T5, T6) and a capture/reload register (CAPREL). Both timers can be clocked with an input clock which is derived from the CPU clock via a programmable prescaler or with external signals. The count direction (up/down) for each timer is programmable by software or may additionally be altered dynamically by an external signal on a port pin (TxEUD). Concatenation of the timers is supported via the output toggle latch (T6OTL) of timer T6 which changes its state on each timer overflow/underflow. The state of this latch may be used to clock timer T5, or it may be output on a port pin (T6OUT). The overflow / underflow of timer T6 can additionally be used to clock the CAPCOM timers T0 or T1, and to cause a reload from the CAPREL register. The CAPREL register may capture the contents of timer T5 based on an external signal transition on the corresponding port pin (CAPIN), and timer T5 may optionally be cleared after the capture procedure. This allows absolute time differences to be measured or pulse multiplication to be performed without software overhead. The capture trigger (timer T5 to CAPREL) may also be generated upon transitions of GPT1 timer T3 inputs T3IN and/or T3EUD. This is advantageous when T3 operates in Incremental Interface mode. Table 37 and Table 38 list the timer input frequencies, resolution and periods for each pre- scaler option at 40MHz and 64MHz CPU clock respectively. Table 37. GPT2 timer input frequencies, resolutions and periods at 40 MHz fCPU = 40MHz Timer Input Selection T5I / T6I 000b 001b 010b 011b 100b 101b 110b 111b Pre-scaler factor 4 8 16 32 64 128 256 512 Input frequency 10MHz 5MHz 2.5MHz 1.25 MHz 625 kHz 312.5 kHz 156.25 kHz 78.125 kHz Resolution 100ns 200ns 400ns 0.8µs 1.6µs 3.2µs 6.4µs 12.8µs Period maximum 6.55ms 13.1ms 26.2ms 52.4ms 104.8ms 209.7ms 419.4ms 838.9ms Table 38. GPT2 timer input frequencies, resolutions and periods at 64 MHz fCPU = 64MHz Timer Input Selection T5I / T6I 000b 001b 010b 011b 100b 101b 110b 111b Pre-scaler factor 4 8 16 32 64 128 256 512 Input frequency 16MHz 8MHz 4MHz 2MHz 1 kHz 500 kHz 250 kHz 128 kHz Resolution 62.5ns 125ns 250ns 0.5µs 1.0µs 2.0µs 4.0µs 8.0µs Period maximum 4.1ms 8.2ms 16.4ms 32.8ms 65.5ms 131.1ms 262.1ms 524.3ms |
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