ST7FLITEU0ICD View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7FLITEU0ICD

8-bit low cost, low pin-count MCU for automotive, with single voltage Flash memory, ADC, timers

STMicroelectronics 

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ST7LUS5, ST7LU05, ST7LU09

Supply, reset and clock management

6.2

6.2.1

Register description

Main clock control/status register (MCCSR)

MCCSR

Reset value: 0000 0000 (00h)

7

6

5

4

3

2

1

0

Reserved

MCO

SMS

-

R/W

R/W

Table 7. MCCSR register description

OObbssoolleettee PPrroodduucctt((ss)) -- OObbssoolleettee PPrroodduucctt((ss)) 6.2.2

Bit Name

Function

7:2 - Reserved, must be kept cleared.

Main clock out enable

1 MCO

This bit is read/write by software and cleared by hardware after a reset. This bit

allows to enable the MCO output clock.

0: MCO clock disabled; I/O port free for general purpose I/O

1: MCO clock enabled

Slow mode select

0 SMS

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)

RC control register (RCCR)

RCCR

Reset value: 1111 1111 (FFh)

7

6

5

4

3

2

1

0

CR[9:2]

R/W

Table 8. RCCR register description

Bit Name

Function

RC oscillator frequency adjustment bits

7:0 CR[9:2]

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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