C8051F021-GQR Silicon Laboratories Inc, C8051F021-GQR Datasheet - Page 224

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

Specifications of C8051F021-GQR

• 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
• For Use With: 336-1200 - DEV KIT FOR F020/F021/F022/F023
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

C8051F020/1/2/3
224
Bits7-0:
Bits7-0:
Bits7-0:
R/W
R/W
R/W
Bit7
Bit7
Bit7
SBUF1.[7:0]: UART1 Buffer Bits 7-0 (MSB-LSB)
This SFR accesses two registers; a transmit shift register and a receive latch register. When data is
written to SBUF1, it goes to the transmit shift register and is held for serial transmission. Writing a
byte to SBUF1 is what initiates the transmission. A read of SBUF1 returns the contents of the receive
latch.
SADDR1.[7:0]: UART1 Slave Address
The contents of this register are used to define the UART1 slave address. Register SADEN1 is a bit
mask to determine which bits of SADDR1 are checked against a received address: corresponding bits
set to logic 1 in SADEN1 are checked; corresponding bits set to logic 0 are “don’t cares”.
SADEN1.[7:0]: UART1 Slave Address Enable
Bits in this register enable corresponding bits in register SADDR1 to determine the UART1 slave
address.
0: Corresponding bit in SADDR1 is a “don’t care”.
1: Corresponding bit in SADDR1 is checked against a received address.
Figure 21.11. SADEN1: UART1 Slave Address Enable Register
R/W
R/W
R/W
Bit6
Bit6
Bit6
Figure 21.10. SADDR1: UART1 Slave Address Register
Figure 21.9. SBUF1: UART1 Data Buffer Register
R/W
R/W
R/W
Bit5
Bit5
Bit5
R/W
R/W
R/W
Bit4
Bit4
Bit4
Rev. 1.4
R/W
R/W
R/W
Bit3
Bit3
Bit3
R/W
R/W
R/W
Bit2
Bit2
Bit2
R/W
R/W
R/W
Bit1
Bit1
Bit1
R/W
R/W
R/W
Bit0
Bit0
Bit0
SFR Address:
SFR Address:
SFR Address:
00000000
00000000
00000000
Reset Value
Reset Value
Reset Value
0xAE
0xF2
0xF3