C8051F360/1/2/3/4/5/6/7/8/9
1.1. CIP-51™ Microcontroller Core
1.1.1. Fully 8051 Compatible
The C8051F36x family 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 CIP-51 core offers all the peripherals included with a standard 8052, including
four 16-bit counter/timers, a full-duplex UART with extended baud rate configuration, an enhanced SPI
port, 1024 bytes of internal RAM, 128 byte Special Function Register (SFR) address space, and up to 39
I/O pins.
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
5
3
3/4
7
4
3
4/5
1
5
2
8
1
Number of Instructions
26
50
14
With the CIP-51's maximum system clock at 100 MHz, it has a peak throughput of 100 MIPS. Figure 1.4
shows a comparison of peak throughputs for various 8-bit microcontroller cores with their maximum sys-
tem clocks.
25
20
15
10
5
Silicon Labs
CIP-51
Microchip
PIC17C75x
Philips
80C51
ADuC812
8051
(25 MHz clk) (33 MHz clk) (33 MHz clk) (16 MHz clk)
Figure 1.4. Comparison of Peak MCU Execution Speeds
22
Rev. 1.0
SILICON [ SILICON ]
