C8051F327-GM Silicon Laboratories Inc, C8051F327-GM Datasheet - Page 118

• Manufacturer Part Number: C8051F327-GM
• Description: IC 8051 MCU FLASH 16K 28QFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F327-GM

• Program Memory Type: FLASH
• Program Memory Size: 16KB (16K x 8)
• Package / Case: 28-QFN
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: UART/USART, USB
• Peripherals: POR
• Number Of I /o: 15
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: C8051F3x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 1.5 KB
• Interface Type: UART/USB
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 15
• Number Of Timers: 2
• 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: C8051F326DK
• Minimum Operating Temperature: - 40 C
• Package: 28QFN EP
• Device Core: 8051
• Family Name: C8051F327
• Maximum Speed: 25 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 336-1481 - DAUGHTER CARD TOOLSTCK C8051F327770-1006 - ISP 4PORT FOR SILABS C8051F MCU
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1297-5

C8051F326/7
13.1. Baud Rate Generator
The UART0 baud rate is generated by a dedicated 16-bit timer which runs from either the controller’s core
clock (SYSCLK) or the USB Clock (USBCLK), and has prescaler options of 1, 4, 12, or 48. The timer and
prescaler options combined allow for a wide selection of baud rates over many clock frequencies.
The baud rate generator is configured using three registers: SBCON0, SBRLH0, and SBRLL0. The
UART0 Baud Rate Generator Control Register (SBCON0, SFR Definition 13.4) enables or disables the
baud rate generator, selects the clock source for the baud rate generator, and selects the prescaler value
for the timer. The baud rate generator must be enabled for UART0 to function. Registers SBRLH0 and
SBRLL0 contain a 16-bit reload value for the dedicated 16-bit timer. The internal timer counts up from the
reload value on every clock tick. On timer overflows (0xFFFF to 0x0000), the timer is reloaded. The baud
rate for UART0 is defined in Equation 13.1, where “BRG Clock” is the baud rate generator’s selected clock
source. For reliable UART operation, it is recommended that the UART baud rate is not configured for
baud rates faster than SYSCLK/16.
A quick reference for typical baud rates and clock frequencies is given in Table 13.1.
118
Baud Rate
Equation 13.1. UART0 Baud Rate
=
-------------------------------------------------------------------------- -
(
65536 (SBRLH0:SBRLL0)
–
BRG Clock
Rev. 1.1
)
×
1
-- -
2
×
--------------------- -
Prescaler
1