C8051F331 Silicon Laboratories Inc, C8051F331 Datasheet - Page 121

• Manufacturer Part Number: C8051F331
• Description: IC 8051 MCU 8K FLASH 20MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F33xr

Specifications of C8051F331

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Bits7-0:
Bits7-0:
Bits7-0:
P1.7
R/W
R/W
R/W
Bit7
Bit7
Bit7
Output Configuration Bits for P0.7-P0.0 (respectively): ignored if corresponding bit in regis-
ter P0MDIN is logic 0.
0: Corresponding P0.n Output is open-drain.
1: Corresponding P0.n Output is push-pull.
(Note: When SDA and SCL appear on any of the Port I/O, each are open-drain regardless
of the value of P0MDOUT).
P0SKIP[7:0]: Port0 Crossbar Skip Enable Bits.
These bits select Port pins to be skipped by the Crossbar Decoder. Port pins used as ana-
log inputs (for ADC or Comparator) or used as special functions (VREF input, external oscil-
lator circuit, CNVSTR input) should be skipped by the Crossbar.
0: Corresponding P0.n pin is not skipped by the Crossbar.
1: Corresponding P0.n pin is skipped by the Crossbar.
P1.[7:0]
Write - Output appears on I/O pins per Crossbar Registers.
0: Logic Low Output.
1: Logic High Output (high impedance if corresponding P1MDOUT.n bit = 0).
Read - Always reads ‘0’ if selected as analog input in register P1MDIN. Directly reads Port
pin when configured as digital input.
0: P1.n pin is logic low.
1: P1.n pin is logic high.
P1.6
R/W
R/W
R/W
Bit6
Bit6
Bit6
Figure 14.9. P0MDOUT: Port0 Output Mode Register
P1.5
R/W
R/W
R/W
Bit5
Bit5
Bit5
Figure 14.10. P0SKIP: Port0 Skip Register
Figure 14.11. P1: Port1 Register
P1.4
R/W
R/W
R/W
Bit4
Bit4
Bit4
C8051F330/1, C8051F330D
Rev. 1.2
P1.3
R/W
R/W
R/W
Bit3
Bit3
Bit3
P1.2
R/W
R/W
R/W
Bit2
Bit2
Bit2
P1.1
R/W
R/W
R/W
Bit1
Bit1
Bit1
(bit addressable)
P1.0
R/W
R/W
R/W
Bit0
Bit0
Bit0
SFR Address:
SFR Address:
SFR Address:
00000000
00000000
Reset Value
Reset Value
Reset Value
11111111
0xA4
0xD4
0x90
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