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MB90480 Datasheet(PDF) 62 Page - Fujitsu Component Limited. |
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MB90480 Datasheet(HTML) 62 Page - Fujitsu Component Limited. |
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62 / 120 page 
MB90480/485 Series 62 12. PWC Timer (MB90485 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. |
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