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ST7LUS5 Folha de dados(PDF) 29 Page - STMicroelectronics

Nome de Peças ST7LUS5
Descrição Electrónicos  8-bit low cost, low pin-count MCU for automotive,with single voltage Flash memory, ADC, timers
PDF  124 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LUS5 Folha de dados(HTML) 29 Page - STMicroelectronics

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ST7LUS5, ST7LU05, ST7LU09
Supply, reset and clock management
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6.2
Register description
6.2.1
Main clock control/status register (MCCSR)
6.2.2
RC control register (RCCR)
MCCSR
Reset value: 0000 0000 (00h)
7
654
32
10
Reserved
SMS
-R/W
Table 7.
MCCSR register description
Bit
Name
Function
7:1
-
Reserved, must be kept cleared.
0SMS
Slow Mode select
This bit is read/write by software and cleared by hardware after a reset. This bit
selects the input clock fOSC or fOSC/32.
0: Normal mode (fCPU = fOSCC)
1: Slow mode (fCPU = fOSCC/32)
RCCR
Reset value: 1111 1111 (FFh)
7
654
32
10
CR[9:2]
R/W
Table 8.
RCCR register description
Bit
Name
Function
7:0 CR[9:2]
RC Oscillator Frequency Adjustment Bits
These bits, as well as CR[1:0] bits in the SICSR register must be written
immediately after reset to adjust the RC oscillator frequency and to obtain the
required accuracy. The application can store the correct value for each voltage
range in Flash memory and write it to this register at start-up.
00h = maximum available frequency
FFh = lowest available frequency
Note: To tune the oscillator, write a series of different values in the register until the
correct frequency is reached. The fastest method is to use a dichotomy starting with
80h.



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