MB90F474LPF datasheet(61/118 Pages) FUJITSU

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MB90470 Series

12. PWC (Pulse Width Count) Timer

The PWC timer is a 16-bit multi-function up-count timer with an input signal pulse width measurement function.

The hardware includes a total of three channels, each with one 16-bit up-count timer, one input pulse divider

and divider ration control register, one measurement input pin, and one 16-bit control register. The following

functions are provided :

Timer functions :

An interrupt can be generated each time a set time interval elapses. A choice of three internal reference clocks

is available.

Pulse width measurement functions :

Measures the time between designated events on an externally input pulse signal. The reference clock is selected

from three internal clock signals.

Measurement modes : 1) H pulse width (

↑ to ↓) /L pulse width (↑ to ↓)

2) Rise period (

↑ to ↑) /fall period (↓ to ↓)

3) Measurement between edges (high or low to low or high)

An 8-bit input divider can divide the input pulse into 22n divisions (n

= 1, 2, 3, 4) and measure the divisions.

An interrupt can be generated when measurement is ended. Both one-time and continuous measurement are

enabled.

MB90F474LPF Datasheet(PDF) 61 Page - fujitsu semiconductor