C8051F537-IM Silicon Laboratories Inc, C8051F537-IM Datasheet - Page 149

• Manufacturer Part Number: C8051F537-IM
• Description: IC 8051 MCU 2K FLASH 20QFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F53xr

Specifications of C8051F537-IM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 2KB (2K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.25 V
• Data Converters: A/D 16x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-QFN
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.25 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 16 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 336-1400

SFR Definition 15.2. SBUF0: Serial (UART0) Port Data Buffer
Table 15.1. Timer Settings for Standard Baud Rates 
Using the Internal Oscillator
Bits7–0: SBUF0[7:0]: Serial Data Buffer Bits 7–0 (MSB–LSB)
R/W
Bit7
Frequency: 24.5 MHz
Target
Baud Rate
(bps)
This SFR accesses two registers; a transmit shift register and a receive latch register. When
data is written to SBUF0, it goes to the transmit shift register and is held for serial transmis-
sion. Writing a byte to SBUF0 initiates the transmission. A read of SBUF0 returns the con-
tents of the receive latch.
230400
115200
57600
28800
14400
9600
2400
1200
R/W
Bit6
Baud Rate
% Error
X = Don’t care
Note: SCA1
–0.32%
–0.32%
–0.32%
–0.32%
–0.32%
0.15%
0.15%
0.15%
R/W
Bit5
–
SCA0 and T1M bit definitions can be found in Section 18.1.
Oscillator
Divide
Factor
R/W
Bit4
10176
20448
C8051F52x/F52xA/F53x/F53xA
1704
2544
106
212
426
848
Rev. 1.3
Timer Clock
Source
SYSCLK / 12
SYSCLK / 12
SYSCLK / 48
SYSCLK / 48
R/W
SYSCLK / 4
Bit3
SYSCLK
SYSCLK
SYSCLK
R/W
Bit2
SCA1–SCA0
(pre-scale
select)*
XX
XX
XX
01
00
00
10
10
R/W
Bit1
SFR Address:
T1M* Timer 1
R/W
Bit0
1
1
1
0
0
0
0
0
Reload
Value (hex)
00000000
Reset Value
0xCB
0x96
0x2B
0x96
0xB9
0x2B
0x96
0x96
0x99
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