C8051F537-IT Silicon Laboratories Inc, C8051F537-IT Datasheet - Page 165

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

Specifications of C8051F537-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: 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-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Other names: 336-1401

Important: The minimum system clock (SYSCLK) to operate the LIN peripheral is 8 MHz.
Use the following equations to calculate the values for the variables for the baud-rate equation:
It is important to note that in all these equations, the results must be rounded down to the nearest integer.
The following example shows the steps for calculating the baud rate values for a Master node running at
24.5 MHz and communicating at 19200 bits/sec. First, calculate the multiplier:
Next, calculate the prescaler:
Finally, calculate the divider:
These values lead to the following baud rate:
prescaler
prescaler
divider
divider
Table 17.1. Baud-Rate Calculation Variable Ranges
baud_rate
=
=
multiplier
=
ln
=
------------------------------------------------------------------------------------------------------------------- -

2
ln
prescaler
------------------------------------------------------------ -
2
multiplier

----------------------------------------------------------------------------------------- -

multiplier
prescaler
Factor
divider

multiplier
-----------------------------------------------------

1
0
+
=
+
C8051F52x/F52xA/F53x/F53xA
1

------------------------------------------------------ -
2
1


24500000
+
24500000

1
=

1

+
0

1
20000
-------------- - 1
19200
19200 200

+

Rev. 1.3
24500000
=
+


1
SYSCLK
multiplier
1


-------------------------- - 1
baud_rate
0
 baud_rate 200

SYSCLK

+
20000
–

19200
1
200…511

Range
=
0…31
0…3

0.0417 0

319
+
=
------- - 1
ln2
–
1
1
319.010 319


–

19200.63


baud_rate
=
1.674


------- - 1
ln2
1


1
–
165