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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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P87LPC778 Scheda tecnica(PDF) 21 Page - NXP Semiconductors |
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P87LPC778 Scheda tecnica(HTML) 21 Page - NXP Semiconductors |
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21 / 79 page  Philips Semiconductors P87LPC778 CMOS single-chip 8-bit microcontroller Product data Rev. 01 — 31 March 2004 21 of 79 9397 750 12378 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. When the counter reaches underflow it is reloaded with a user selectable value. This mechanism allows the user to set the PWM frequency at any integer sub-multiple of the microcontroller clock frequency. The repetition frequency of the PWM is given by: (4) Where CNSW is contained in SFRs CNSW0 and CNSW1 as a 10-bit value, described in the following tables. The word ‘Shadow’ refers to the fact that writes are not into the register that controls the counter; rather they are into a holding register. As described below the transfer of data from this holding register, into the register which contains the actual reload value, is controlled by the user’s program, by setting the XFER bit and waiting till the next underflow of the counter. Table 11: CNSW0 - Counter shadow register 0 (address 0D1H) bit allocation Reset value: FFH Bit 7 6 5 4 3 2 1 0 Symbol CNSW7 CNSW6 CNSW5 CNSW4 CNSW3 CNSW2 CNSW1 CNSW0 Table 12: CNSW1 - Counter shadow register 1 (address 0D2H) bit allocation Reset value: FFH Bit 7 6 5 4 3 2 1 0 Symbol Unused Unused Unused Unused Unused Unused CNSW9 CNSW8 f PWM f CPWM CNSW 1 + () ------------------------------- = |
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