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MB90480 Datasheet(PDF) 46 Page - Fujitsu Component Limited. |
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MB90480 Datasheet(HTML) 46 Page - Fujitsu Component Limited. |
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46 / 120 page 
MB90480/485 Series 46 6. 8/16-bit up/down Counter/Timer 8/16-bit up/down counter/timer consists of up/down counter/timer circuits including six event input pins, two 8-bit up/down counters, two 8-bit reload/compare registers, as well as the related control circuits. (1) Principal Functions • 8-bit count register enables counting in the range 0 to 256. (In 16-bit × 1 mode, counting is enabled in the range 0 to 65535) • Count clock selection provides four count modes. • In timer mode, there is a choice of two internal count clock signals. • In up/down count mode, there is a choice of trigger edge detection for the input signal from external pins. • In phase differential count mode, to handle encoder counting for motors, the encoder A-phase, B-phase, and Z-phase are each input, enabling easy and highly accurate counting of angle of rotation, speed of rotation, etc. • The ZIN pin provides a selection of two functions. • A compare function and reload function are provided, each for use separately or in combination. Both functions can be activated together for up/down counting in any desired bandwidth. • Individual control over interrupts at compare, reload (underflow) and overflow events. • Count direction flag enables identification of the last previous count direction. • Interrupt generated when count direction changes. Count modes Timer mode Up/down count mode Phase differential down count mode ( × 2) Phase differential down count mode ( × 8) Count clock 125 ns (8 MHz : × 2) (at 16 MHz operation) 0.5 µs (2 MHz : × 8) Edge detection Falling edge detection Rising edge detection Both rising/falling edge detection Edge detection disabled ZIN pin Counter clear function Gate functions Compare/reload function Compare function (output interrupt at compare events) Compare function (output interrupt and clear counter at compare events) Reload function (output interrupt and reload at underflow events) Compare/reload function (output interrupt and clear counter at compare events, output interrupt and reload at underflow events) Compare/reload disabled |
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