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C8051F040-GQR Datasheet(PDF) 25 Page - Silicon Laboratories |
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C8051F040-GQR Datasheet(HTML) 25 Page - Silicon Laboratories |
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25 / 328 page  C8051F040/1/2/3/4/5/6/7 Rev. 1.5 25 1.1. CIP-51™ Microcontroller Core 1.1.1. Fully 8051 Compatible The C8051F04x family of devices utilizes Silicon Labs' proprietary CIP-51 microcontroller core. The CIP- 51 is fully compatible with the MCS-51™ instruction set; standard 803x/805x assemblers and compilers can be used to develop software. The core has all the peripherals included with a standard 8052, including five 16-bit counter/timers, two full-duplex UARTs, 256 bytes of internal RAM, 128 byte Special Function Register (SFR) address space, and up to 8 byte-wide I/O Ports. 1.1.2. Improved Throughput The CIP-51 employs a pipelined architecture that greatly increases its instruction throughput over the stan- dard 8051 architecture. In a standard 8051, all instructions except for MUL and DIV take 12 or 24 system clock cycles to execute with a maximum system clock of 12-to-24 MHz. By contrast, the CIP-51 core exe- cutes 70% of its instructions in one or two system clock cycles, with only four instructions taking more than four system clock cycles. The CIP-51 has a total of 109 instructions. The table below shows the total number of instructions that require each execution time. With the CIP-51's maximum system clock at 25 MHz, it has a peak throughput of 25 MIPS. Figure 1.5 shows a comparison of peak throughputs of various 8-bit microcontroller cores with their maximum system clocks. Figure 1.5. Comparison of Peak MCU Execution Speeds Clocks to Execute 1 2 2/3 3 3/4 4 4/5 5 8 Number of Instructions 26 50 5 14 7 3 1 2 1 5 10 15 20 ADuC812 8051 (16 MHz clk) Philips 80C51 (33 MHz clk) Microchip PIC17C75x (33 MHz clk) Silicon Labs CIP-51 (25 MHz clk) 25 |
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