MB90F482B datasheet(62/124 Pages) FUJITSU

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MB90480B/485B Series

DS07-13722-11E

12. PWC Timer (MB90485B series only)

The PWC timer is a 16-bit multifunction up-count timer capable of measuring the pulse width of the input signal.

A total of three channels are provided, each consisting of a 16-bit up-count timer, an input pulse divider & divide

ratio control register, a measurement input pin, and a 16-bit control register. These components provide the

following functions.

Timer function :

• Capable of generating an interrupt request at fixed intervals specified.

• The internal clock used as the reference clock can be selected from

among three types.

Pulse width measurement function :

• Measures the time between arbitrary events based on external pulse

inputs.

• The internal clock used as the reference clock can be selected from

among three types.

• Measurement modes

- “H” pulse width (

↑ to ↓) /“L” pulse width (↑ to ↓)

- Rising cycle (

↑ to ↑) /Falling cycle (↓ to ↓)

- Measurement between edges (

↑ or ↓ to ↓ or ↑)

• The 8-bit input divider can be used for division measurement by dividing

the input pulse by 22

× n (n = 1, 2, 3, 4) .

• An interrupt can be generated upon completion of measurement.

• One-time measurement or fast measurement can be selected.

MB90F482B Scheda tecnica(PDF) 62 Page - fujitsu semiconductor