C8051F321R Silicon Laboratories Inc, C8051F321R Datasheet - Page 20

• Manufacturer Part Number: C8051F321R
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321R

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: 336-1067-2

C8051F320/1
1.1.
1.1.1. Fully 8051 Compatible
The C8051F320/1 family utilizes Silicon Labs' proprietary CIP-51 microcontroller core. The CIP-51 is fully compat-
ible with the MCS-51™ instruction set; standard 803x/805x assemblers and compilers can be used to develop soft-
ware. 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, 2304 bytes of on-chip RAM,
128 byte Special Function Register (SFR) address space, and 25/21 I/O pins.
1.1.2. Improved Throughput
The CIP-51 employs a pipelined architecture that greatly increases its instruction throughput over the standard 8051
architecture. In a standard 8051, all instructions except for MUL and DIV take 12 or 24 system clock cycles to exe-
cute with 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 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 1.3 shows a com-
parison of peak throughputs for various 8-bit microcontroller cores with their maximum system clocks.
20
Number of Instructions
Clocks to Execute
CIP-51™ Microcontroller Core
Figure 1.3. Comparison of Peak MCU Execution Speeds
25
20
15
10
5
26
1
Silicon Labs
(25MHz clk)
CIP-51
50
2
(33MHz clk)
PIC17C75x
2/3
Rev. 1.1
5
Microchip
14
3
(33MHz clk)
Philips
80C51
3/4
7
4
3
(16MHz clk)
ADuC812
8051
4/5
1
5
2
8
1