ST7LITEUS5 datasheet(31/136 Pages) STMICROELECTRONICS

31 / 136 page

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ST7LITEUS2, ST7LITEUS5

Supply, reset and clock management

31/136

6.3.2

RC Control register (RCCR)

Reset value: 1111 1111 (FFh)

6.3.3

System Integrity (SI) Control/status register (SICSR)

Reset value: 0000 0x00 (0xh)

CR9

CR8

CR7

CR6

CR5

CR4

CR3

CR2

Read / Write

Bits 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 startup.

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.

CR1

CR0

LVDRF

AVDF

AVDIE

Read / Write

Bit 7 Reserved, must be kept cleared.

Bits 6:5 CR[1:0] RC Oscillator Frequency Adjustment bits

These bits, as well as CR[9:2] bits in the RCCR register must be written

immediately after reset to adjust the RC oscillator frequency and to obtain the

required accuracy. Refer to Section 6.2 on page 28.

Bits 4:3 Reserved, must be kept cleared.

Bits 2:0 System Integrity bits. Refer to Section 7.4 on page 43.

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ST7LITEUS5 Datasheet(PDF) 31 Page - STMicroelectronics

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