Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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C8051F120/1/2/3 C8051F124/5/6/7 Preliminary 24.2.3. High Speed Output Mode In High Speed Output mode, a module’s associated CEXn pin is toggled each time a match occurs between the PCA Counter and the module's 16-bit capture/compare register (PCA0CPHn and PCA0CPLn) Setting the TOGn, MATn, and ECOMn bits in the PCA0CPMn register enables the High-Speed Output mode. Figure 24.6. PCA High Speed Output Mode Diagram Write to PCA0CPLn Reset 0 ENB Write to PCA0CPHn ENB 1 PCA0CPMn P E C C M T P E W C A A A O W C M O P P T G M C 1 M P N n n n F 6 n n n n n x 0 0 0 x PCA Interrupt PCA0CPLn PCA0CPHn PCA0CN C C C C C C C C F R C C C C C C F F F F F F 5 4 3 2 1 0 Enable 16-bit Comparator Match 0 1 PCA Timebase PCA0L PCA0H Toggle TOGn 0 1 CEXn Crossbar Port I/O Page 296 DS008-0.8-AUG02 © 2002 Cygnal Integrated Products, Inc.
Preliminary C8051F120/1/2/3 C8051F124/5/6/7 24.2.4. Frequency Output Mode Frequency Output Mode produces a programmable-frequency square wave on the module’s associated CEXn pin. The capture/compare module high byte holds the number of PCA clocks to count before the output is toggled. The frequency of the square wave is then defined by Equation 24.1. Equation 24.1. Square Wave Frequency Output F sqr = F PCA ---------------------------------------- 2 × PCA0CPHn Where F PCA is the frequency of the clock selected by the CPS2-0 bits in the PCA mode register, PCA0MD. The lower byte of the capture/compare module is compared to the PCA0 counter low byte; on a match, CEXn is toggled and the offset held in the high byte is added to the matched value in PCA0CPLn. Frequency Output Mode is enabled by setting the ECOMn, TOGn, and PWMn bits in the PCA0CPMn register. Figure 24.7. PCA Frequency Output Mode PCA0CPMn P E C C M T P E W C A A A O W C M O P P T G M C 1 M P N n n n F 6 n n n n n 0 0 0 0 1 0 Enable PCA0CPLn 8-bit Comparator match 8-bit Adder Adder Enable Toggle TOGn 0 1 PCA0CPHn CEXn Crossbar Port I/O PCA Timebase PCA0L © 2002 Cygnal Integrated Products, Inc. DS008-0.8-AUG02 Page 297
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Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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