C8051F124-GQR Datasheet, PDF (127/350 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family

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11. CIP-51 Microcontroller
The MCU system controller core is the CIP-51 microcontroller. The CIP-51 is fully compatible with the
MCS-51™ instruction set; standard 803x/805x assemblers and compilers can be used to develop soft-
ware. The MCU family has a superset of all the peripherals included with a standard 8051. Included are
five 16-bit counter/timers (see description in Section 23), two full-duplex UARTs (see description in Sec-
tion 21 and Section 22), 256 bytes of internal RAM, 128 byte Special Function Register (SFR) address
space (see Section 11.2.6), and 8/4 byte-wide I/O Ports (see description in Section 18). The CIP-51 also
includes on-chip debug hardware (see description in Section 25), and interfaces directly with the MCU’s
analog and digital subsystems providing a complete data acquisition or control-system solution in a single
integrated circuit.
The CIP-51 Microcontroller core implements the standard 8051 organization and peripherals as well as
additional custom peripherals and functions to extend its capability (see Figure 11.1 for a block diagram).
- Fully Compatible with MCS-51 Instruction Set
- 100 or 50 MIPS Peak Using the On-Chip PLL
- 256 Bytes of Internal RAM
- 8/4 Byte-Wide I/O Ports
- Extended Interrupt Handler
- Reset Input
- Power Management Modes
- On-chip Debug Logic
- Program and Data Memory Security
The CIP-51 includes the following features:
Performance
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 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 100 MHz, it has a peak throughput of 100 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
1
2
2/3
3
3/4
4
4/5
5
8
Number of Instructions 26
50
5
14
7
3
1
2
1
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