C8051F021 Silicon Laboratories Inc, C8051F021 Datasheet - Page 180

• 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
180
Bits7-0:
Bits7-0:
Note:
P4.7
P5.7
R/W
R/W
Bit7
Bit7
P4.[7:0]: Port4 Output Latch Bits.
Write - Output appears on I/O pins.
0: Logic Low Output.
1: Logic High Output (Open-Drain if corresponding P74OUT bit = 0). See Figure 17.20.
Read - Returns states of I/O pins.
0: P4.n pin is logic low.
1: P4.n pin is logic high.
Note: P4.7 (/WR), P4.6 (/RD), and P4.5 (ALE) can be driven by the External Data Memory Interface.
See
page 145
P5.[7:0]: Port5 Output Latch Bits.
Write - Output appears on I/O pins.
0: Logic Low Output.
1: Logic High Output (Open-Drain if corresponding P74OUT bit = 0). See Figure 17.20.
Read - Returns states of I/O pins.
0: P5.n pin is logic low.
1: P5.n pin is logic high.
P5.[7:0] can be driven by the External Data Memory Interface (as Address[15:8] in Non-multiplexed
mode). See
on page 145
Section “16. EXTERNAL DATA MEMORY INTERFACE AND ON-CHIP XRAM” on
P4.6
P5.6
R/W
R/W
Bit6
Bit6
for more information.
Section “16. EXTERNAL DATA MEMORY INTERFACE AND ON-CHIP XRAM”
for more information about the External Memory Interface.
P4.5
P5.5
R/W
R/W
Bit5
Bit5
Figure 17.21. P4: Port4 Data Register
Figure 17.22. P5: Port5 Data Register
P4.4
P5.4
R/W
R/W
Bit4
Bit4
Rev. 1.4
P4.3
P5.3
R/W
R/W
Bit3
Bit3
P4.2
P5.2
R/W
R/W
Bit2
Bit2
P4.1
P5.1
R/W
R/W
Bit1
Bit1
P4.0
P5.0
R/W
R/W
Bit0
Bit0
SFR Address:
SFR Address:
Reset Value
11111111
Reset Value
11111111
0x84
0x85