MB90F474LPF datasheet(45/118 Pages) FUJITSU

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MB90470 Series

8/16-bit Up-down Counter/Timer

This block is an up-down counter/timer configured with six event input pins, two 8-bit up/down counters, two

8-bit reload/compare registers, and related control circuits.

(1) Principal functions

• 8-bit count registers for counting in the range 0 to 256.

(Also operates in 16-bit

× 1 mode for counting in the range 0 to 65535.)

• Count clock selection provides four count modes.

• In timer mode, there is a choice of two internal count clocks.

• In up/down count mode, there is a choice of external pin input signal detection edge.

• In phase differential count mode, to provide counts for encoders for motors, etc., the A phase, B phase, and

Z phase of the encoder can be input separately for highly precise counts of rotation angle, rotary speed, etc.

• The ZIN pin provides a choice of two functions.

• Compare and reload functions are provided, each available independently or in combination. Both can be

started together to provide any desired type of up/down count.

• Individually controllable interrupts at compare, reload (underflow) and overflow events.

• Count direction flag enables detection of immediately preceding count direction.

• Interrupt generation at change of count direction.

Count mode

Time mode

Up/down count mode

Phase differential count mode (2

× )

Phase differential count mode (8

× )

Count clock

125 ns (8 MHz : divided by 2)

(16 MHz operation)

0.5

µs (2 MHz : divided by 8)

Detection edge

Falling edge detection

Rising edge detection

Falling/rising edge, both edges’ detection

Edge detection disabled

ZIN pin

Counter clear function

Gate function

Compare/reload function

Compare function (outputs interrupt at compare events)

Compare function (outputs interrupt and clears count at compare events)

Reload function (outputs interrupt and reloads at underflow events)

Compare/reload function

(outputs interrupt and clears count at compare events, outputs interrupt

and reloads at underflow events)

Compare/reload disabled

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