C8051F021 Silicon Laboratories Inc, C8051F021 Datasheet - Page 176

• Manufacturer Part Number: C8051F021
• Description: IC 8051 MCU 64K FLASH 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F02xr

Specifications of C8051F021

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x8b, 8x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

C8051F020/1/2/3
176
Bits7-0:
Note:
Bits7-0:
Note:
P3.7
R/W
R/W
Bit7
Bit7
P3.[7:0]: Port3 Output Latch Bits.
(Write - Output appears on I/O pins per XBR0, XBR1, XBR2, and XBR3 Registers)
0: Logic Low Output.
1: Logic High Output (open if corresponding P3MDOUT.n bit = 0).
(Read - Regardless of XBR0, XBR1, XBR2, and XBR3 Register settings).
0: P3.n pin is logic low.
1: P3.n pin is logic high.
P3.[7:0] can be driven by the External Data Memory Interface (as AD[7:0] in Multiplexed mode, or
as D[7:0] in Non-multiplexed mode). See
FACE AND ON-CHIP XRAM” on page 145
Interface.
P3MDOUT.[7:0]: Port3 Output Mode Bits.
0: Port Pin output mode is configured as Open-Drain.
1: Port Pin output mode is configured as Push-Pull.
SDA, SCL, and RX0 (when UART0 is in Mode 0) and RX1 (when UART1 is in Mode 0) are always
configured as Open-Drain when they appear on Port pins.
P3.6
R/W
R/W
Bit6
Bit6
Figure 17.18. P3MDOUT: Port3 Output Mode Register
P3.5
R/W
R/W
Bit5
Bit5
Figure 17.17. P3: Port3 Data Register
P3.4
R/W
R/W
Bit4
Bit4
Rev. 1.4
P3.3
Section “16. EXTERNAL DATA MEMORY INTER-
R/W
R/W
Bit3
Bit3
for more information about the External Memory
P3.2
R/W
R/W
Bit2
Bit2
P3.1
R/W
R/W
Bit1
Bit1
(bit addressable)
P3.0
R/W
R/W
Bit0
Bit0
SFR Address:
SFR Address:
00000000
Reset Value
11111111
Reset Value
0xB0
0xA7