C8051F043 Просмотр технического описания (PDF) - Silicon Laboratories

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C8051F043

Mixed Signal ISP Flash MCU Family

Silicon Laboratories 

C8051F040/1/2/3/4/5/6/7

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.

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

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.

25

20

15

10

5

Silicon Labs Microchip Philips ADuC812

CIP-51 PIC17C75x 80C51

8051

(25 MHz clk) (33 MHz clk) (33 MHz clk) (16 MHz clk)

Figure 1.5. Comparison of Peak MCU Execution Speeds

Rev. 1.5

25

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