C8051F236-GQR Silicon Laboratories Inc, C8051F236-GQR Datasheet - Page 123

• Manufacturer Part Number: C8051F236-GQR
• Description: IC 8051 MCU 8K FLASH 48TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F2xxr

Specifications of C8051F236-GQR

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 32
• 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
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TQFP, 48-VQFP
• Processor Series: C8051F2x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 1.25 KB
• Interface Type: SPI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3 bit
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F226DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 32 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Bits7–0: SBUF.[7:0]: Serial Data Buffer Bits 7–0 (MSB-LSB)
Oscillator Frequency
R/W
Bit7
Table 16.2. Oscillator Frequencies for Standard Baud Rates (Continued)
16.5888
14.7456
12.9024
22.1184
11.0592
7.3728
5.5296
3.6864
1.8432
24.576
24.576
23.592
18.432
7.3728
5.5296
3.6864
1.8432
(MHz)
9.216
This is actually two registers; a transmit and a receive buffer register. When data is moved
to SBUF, it goes to the transmit buffer and is held for serial transmission. Moving a byte to
SBUF is what initiates the transmission. When data is moved from SBUF, it comes from the
receive buffer.
25.0
25.0
24.0
R/W
Bit6
SFR Definition 16.1. SBUF: Serial (UART) Data Buffer
R/W
Bit5
Divide Factor
R/W
Bit4
320
434
868
848
833
819
768
640
576
512
448
348
320
256
192
128
64
48
32
16
64
Rev. 1.6
R/W
Bit3
Timer 1 Load Value*
R/W
Bit2
0xCC
0xCD
0xDC
0xFC
0xFD
0xEC
0xCA
0xCB
0xEC
0xFC
0xFE
0xFF
0xE5
0xD0
0xD8
0xE0
0xE4
0xE8
0xF0
0xF4
0xF8
R/W
Bit1
Resulting Baud Rate**
C8051F2xx
57600 (57870)
28800 (28921)
28800 (28846)
28800 (28911)
R/W
Bit0
115200
115200
115200
115200
76800
28800
28800
28800
28800
28800
28800
28800
28800
28800
28800
28800
28800
SFR Address:
Reset Value
00000000
0x99
123