C8051F410/1/2/3
1.1.
CIP-51™ Microcontroller
1.1.1. Fully 8051 Compatible Instruction Set
The C8051F41x devices use Silicon Laboratories’ 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 C8051F41x family has a superset of all the peripherals included with a stan-
dard 8052.
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, and usually have a maximum system clock of 12-to-24 MHz. By contrast, the CIP-
51 core executes 70% of its instructions in one or two system clock cycles, with no instructions taking more
than eight system clock cycles.
With the CIP-51's system clock running at 50 MHz, it has a peak throughput of 50 MIPS. 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
Number of Instructions
1
26
2
50
2/4
5
3
10
3/5
7
4
5
5
2
4/6
1
6
2
8
1
1.1.3. Additional Features
The C8051F41x SoC family includes several key enhancements to the CIP-51 core and peripherals to
improve performance and ease of use in end applications.
An extended interrupt handler allows the numerous analog and digital peripherals to operate indepen-
dently of the controller core and interrupt the controller only when necessary. By requiring less intervention
from the microcontroller core, an interrupt-driven system is more efficient and allows for easier implemen-
tation of multi-tasking, real-time systems.
Eight reset sources are available: power-on reset circuitry (POR), an on-chip V
DD
monitor, a Watchdog
Timer, a Missing Clock Detector, a voltage level detection from Comparator0, a smaRTClock alarm or
missing smaRTClock clock detector reset, a forced software reset, an external reset pin, and an illegal
Flash access protection circuit. Each reset source except for the POR, Reset Input Pin, or Flash error may
be disabled by the user in software. The WDT may be permanently enabled in software after a power-on
reset during MCU initialization.
The internal oscillator is factory calibrated to 24.5 MHz ±2%. An external oscillator drive circuit is also
included, allowing an external crystal, ceramic resonator, capacitor, RC, or CMOS clock source to generate
the system clock. A clock multiplier allows for operation at up to 50 MHz. The dedicated smaRTClock oscil-
lator can be extremely useful in low power applications, allowing the system to maintain accurate time
while the MCU is not powered, or its internal oscillator is suspended. The MCU can be reset or have its
oscillator awakened using the smaRTClock alarm function.
Rev. 1.0
25
SILABS [ SILICON LABORATORIES ]
