C8051F300 Silicon Laboratories Inc, C8051F300 Datasheet - Page 97

• Manufacturer Part Number: C8051F300
• Description: IC 8051 MCU 8K FLASH 11MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F30xr

Specifications of C8051F300

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), UART/USART
• Peripherals: POR, PWM, Temp Sensor, WDT
• Number Of I /o: 8
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 11-VQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Registers XBR1 and XBR2 are used to assign the digital I/O resources to the physical I/O Port pins. Note that when
the SMBus is selected, the Crossbar assigns both pins associated with the SMBus (SDA and SCL). Either or both of
the UART signals may be selected by the Crossbar. UART0 pin assignments are fixed for bootloading purposes:
when UART TX0 is selected, it is always assigned to P0.4; when UART RX0 is selected, it is always assigned to
P0.5. Standard Port I/Os appear contiguously after the prioritized functions have been assigned. For example, if
assigned functions that take the first 3 Port I/O (P0.[2:0]), 5 Port I/O are left for analog or GPIO use.
SF Signals
PIN I/O
TX0
RX0
SDA
SCL
CP0
CP0A
SYSCLK
CEX0
CEX1
CEX2
ECI
T0
T1
SF Signals
Figure 12.4. Crossbar Priority Decoder with XBR0 = 0x44
VREF
0
0
Port pin potentially available to peripheral
Port pin skipped by CrossBar
Special Function Signals are not assigned by the crossbar. When
these signals are enabled, the CrossBar must be manually
configured to skip their corresponding port pins. Note: x1 refers to
the XTAL1 signal; x2 refers to the XTAL2 signal.
1
0
x1
2
1
XBR0[0:7]
x2
3
0
P0
4
0
Rev. 2.3
5
0
CNVSTR
6
1
7
0
C8051F300/1/2/3/4/5
97