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C8051F124-GQR Datasheet(PDF) 33 Page - Silicon Laboratories |
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C8051F124-GQR Datasheet(HTML) 33 Page - Silicon Laboratories |
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33 / 350 page  C8051F120/1/2/3/4/5/6/7 C8051F130/1/2/3 Rev. 1.4 33 1.6. Programmable Counter Array An on-board Programmable Counter/Timer Array (PCA) is included in addition to the five 16-bit general purpose counter/timers. The PCA consists of a dedicated 16-bit counter/timer time base with 6 program- mable capture/compare modules. The timebase is clocked from one of six sources: the system clock divided by 12, the system clock divided by 4, Timer 0 overflow, an External Clock Input (ECI pin), the sys- tem clock, or the external oscillator source divided by 8. Each capture/compare module can be configured to operate in one of six modes: Edge-Triggered Capture, Software Timer, High Speed Output, Frequency Output, 8-Bit Pulse Width Modulator, or 16-Bit Pulse Width Modulator. The PCA Capture/Compare Module I/O and External Clock Input are routed to the MCU Port I/ O via the Digital Crossbar. Figure 1.12. PCA Block Diagram 1.7. Serial Ports Serial peripherals included on the devices are two Enhanced Full-Duplex UARTs, SPI Bus, and SMBus/ I2C. Each of the serial buses is fully implemented in hardware and makes extensive use of the CIP-51's interrupts, thus requiring very little intervention by the CPU. The serial buses do not "share" resources such as timers, interrupts, or Port I/O, so any or all of the serial buses may be used together with any other. Capture/Compare Module 1 Capture/Compare Module 0 Capture/Compare Module 2 Capture/Compare Module 3 Crossbar Port I/O 16-Bit Counter/Timer PCA CLOCK MUX SYSCLK/12 SYSCLK/4 Timer 0 Overflow ECI SYSCLK External Clock/8 Capture/Compare Module 4 Capture/Compare Module 5 |
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