C8051F412-GQ Silicon Laboratories Inc, C8051F412-GQ Datasheet - Page 208
C8051F412-GQ
Manufacturer Part Number
C8051F412-GQ
Description
IC 8051 MCU 16K FLASH 32LQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F41xr
Specifications of C8051F412-GQ
Program Memory Type
FLASH
Program Memory Size
16KB (16K x 8)
Package / Case
32-LQFP
Core Processor
8051
Core Size
8-Bit
Speed
50MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
24
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.25 V
Data Converters
A/D 20x12b; D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
C8051F4x
Core
8051
Data Bus Width
8 bit
Data Ram Size
2.25 KB
Interface Type
I2C/SMBus/SPI/UART
Maximum Clock Frequency
50 MHz
Number Of Programmable I/os
24
Number Of Timers
4
Operating Supply Voltage
2 V to 5.25 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F410DK
Minimum Operating Temperature
- 40 C
On-chip Dac
2-ch x 12-bit
No. Of I/o's
24
Ram Memory Size
2368Byte
Cpu Speed
50MHz
No. Of Timers
4
Rohs Compliant
Yes
Package
32LQFP
Device Core
8051
Family Name
C8051F41x
Maximum Speed
50 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
770-1006 - ISP 4PORT FOR SILABS C8051F MCU336-1453 - ADAPTER PROGRAM TOOLSTICK F410336-1317 - KIT EVAL FOR C8051F411336-1314 - KIT DEV FOR C8051F41X
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1310
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F412-GQ
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
Company:
Part Number:
C8051F412-GQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
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C8051F410/1/2/3
22.1. Enhanced Baud Rate Generation
The UART0 baud rate is generated by Timer 1 in 8-bit auto-reload mode. The TX clock is generated by
TL1; the RX clock is generated by a copy of TL1 (shown as RX Timer in Figure 22.2), which is not user-
accessible. Both TX and RX Timer overflows are divided by two to generate the TX and RX baud rates.
The RX Timer runs when Timer 1 is enabled, and uses the same reload value (TH1). However, an
RX Timer reload is forced when a START condition is detected on the RX pin. This allows a receive to
begin any time a START is detected, independent of the TX Timer state.
Timer 1 should be configured for Mode 2, 8-bit auto-reload (see
ter/Timer with Auto-Reload” on page 233
occur at two times the desired UART baud rate frequency. Note that Timer 1 may be clocked by one of six
sources: SYSCLK, SYSCLK / 4, SYSCLK / 12, SYSCLK / 48, the external oscillator clock / 8, or an exter-
nal input T1. The UART0 baud rate is determined by Equation 22.1-A and Equation 22.1-B.
Where T1
auto-reload mode reload value). Timer 1 clock frequency is selected as described in
on page 231
through Table 22.6. Note that the internal oscillator may still generate the system clock when the external
oscillator is driving Timer 1.
208
CLK
. A quick reference for typical baud rates and system clock frequencies is given in Table 22.1
is the frequency of the clock supplied to Timer 1, and T1H is the high byte of Timer 1 (8-bit
Detected
Start
A)
B)
Figure 22.2. UART0 Baud Rate Logic
UartBaudRate
T1_Overflow_Rate
RX Timer
Equation 22.1. UART0 Baud Rate
Timer 1
TH1
TL1
). The Timer 1 reload value should be set so that overflows will
=
Overflow
Overflow
Rev. 1.1
1
-- -
2
=
T1_Overflow_Rate
------------------------- -
256 TH1
T1
–
CLK
2
2
Section “24.1.3. Mode 2: 8-bit Coun-
UART
RX Clock
TX Clock
Section “24. Timers”
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