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C8051F300 Datasheet(PDF) 23 Page - List of Unclassifed Manufacturers |
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C8051F300 Datasheet(HTML) 23 Page - List of Unclassifed Manufacturers |
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23 / 174 page  C8051F300/1/2/3/4/5 Rev. 2.6 23 1.6. Programmable Counter Array An on-chip Programmable Counter/Timer Array (PCA) is included in addition to the three 16-bit general purpose counter/timers. The PCA consists of a dedicated 16-bit counter/timer time base with three pro- grammable capture/compare modules. The PCA clock is derived from one of six sources: the system clock divided by 12, the system clock divided by 4, Timer 0 overflows, an External Clock Input (ECI), the system clock, or the external oscillator clock source divided by 8. The external clock source selection is useful for real-time clock functionality, where the PCA is clocked by an external source while the internal oscillator drives the system clock. Each capture/compare module can be configured to operate in one of six modes: Edge-Triggered Capture, Software Timer, High Speed Output, 8- or 16-bit Pulse Width Modulator, or Frequency Output. Additionally, Capture/Compare Module 2 offers watchdog timer (WDT) capabilities. Following a system reset, Module 2 is configured and enabled in WDT mode. The PCA Capture/Compare Module I/O and External Clock Input may be routed to Port I/O via the Digital Crossbar. Figure 1.9. PCA Block Diagram 16-Bit Counter/Timer Digital Crossbar Port I/O Capture/Compare Module 1 Capture/Compare Module 0 Capture/Compare Module 2 PCA CLOCK MUX SYSCLK/12 SYSCLK/4 Timer 0 Overflow ECI SYSCLK External Clock/8 |
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