C8051F531-IT Silicon Laboratories Inc, C8051F531-IT Datasheet - Page 144
![IC 8051 MCU 8K FLASH 20TSSOP](/photos/12/46/124608/silicon_laboratories_inc-20-tssop_sml.jpg)
C8051F531-IT
Manufacturer Part Number
C8051F531-IT
Description
IC 8051 MCU 8K FLASH 20TSSOP
Manufacturer
Silicon Laboratories Inc
Series
C8051F53xr
Specifications of C8051F531-IT
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
8KB (8K 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-TSSOP
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
336-1393
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F531-IT
Manufacturer:
SILICON
Quantity:
205
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C8051F52x/F52xA/F53x/F53xA
15.1. 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 15.2), 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 Section “18.1.3. Mode 2: 8-bit Coun-
ter/Timer with Auto-Reload” on page 183). The Timer 1 reload value should be set so that overflows will
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 15.1-A and Equation 15.1-B.
Where T1
auto-reload mode reload value). Timer 1 clock frequency is selected as described in Section “18. Timers”
on page 181. A quick reference for typical baud rates and system clock frequencies is given in Table 15.1.
Note that the internal oscillator may still generate the system clock when the external oscillator is driving
Timer 1.
144
CLK
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)
UartBaudRate
T1_Overflow_Rate
Figure 15.2. UART0 Baud Rate Logic
RX Timer
Equation 15.1. UART0 Baud Rate
Timer 1
TH1
TL1
=
Overflow
Overflow
Rev. 1.3
1
-- - x T1_Overflow_Rate
2
=
-------------------------- -
256 TH1
T1
–
CLK
2
2
UART
RX Clock
TX Clock
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