MB90F482B datasheet(46/124 Pages) FUJITSU

46 / 124 page

MB90480B/485B Series

DS07-13722-11E

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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