C8051F312 Silicon Laboratories Inc, C8051F312 Datasheet - Page 139

• Manufacturer Part Number: C8051F312
• Description: IC 8051 MCU 8K FLASH 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F31xr

Specifications of C8051F312

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, Temp Sensor, WDT
• Number Of I /o: 29
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 21x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: 336-1151

Note:
Bits7–0: Output Configuration Bits for P1.7-P1.0 (respectively): ignored if corresponding bit in regis-
Bits7–0: P1SKIP[7:0]: Port1 Crossbar Skip Enable Bits.
Note:
R/W
R/W
Bit7
Bit7
Only P1.0–P1.5 are associated with Port pins on the C8051F316/7 devices.
ter P1MDIN is logic 0.
0: Corresponding P1.n Output is open-drain.
1: Corresponding P1.n Output is push-pull.
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 P1.n pin is not skipped by the Crossbar.
1: Corresponding P1.n pin is skipped by the Crossbar.
Only P1.0–P1.5 are associated with Port pins on the C8051F316/7 devices. Hence, in C8051F316/7
devices, user code writing to this SFR should always set P1SKIP[7:6] = 11b so that those two pins are
skipped by the crossbar decoder.
R/W
Bit6
R/W
Bit6
SFR Definition 13.9. P1MDOUT: Port1 Output Mode
SFR Definition 13.10. P1SKIP: Port1 Skip
R/W
Bit5
R/W
Bit5
R/W
Bit4
R/W
Bit4
R/W
Bit3
Rev. 1.7
R/W
Bit3
C8051F310/1/2/3/4/5/6/7
R/W
Bit2
R/W
Bit2
R/W
Bit1
R/W
Bit1
R/W
Bit0
R/W
Bit0
‘F310/1/2/3/4/5:
SFR Address:
00000000
Reset Value
11000000
‘F316/7:
SFR Address:
00000000
0xD5
Reset Value
0xA5
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