UM0097 datasheet(18/229 Pages) STMICROELECTRONICS

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Peripheral firmware overview

UM0097

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vu16 PWRCR;

u16

EMPTY6;

} PCU_TypeDef;

Table 4 describes the PCU structure fields:

The PCU peripheral is declared in the same file:

...

#define PCU_BASE

0xA0000040

...

#ifndef DEBUG

...

#ifdef _PCU

#define PCU

((PCU_TypeDef *)PCU_BASE)

#endif /*PCU*/

...

#else

/* DEBUG */

...

#ifdef _PCU

EXT PCU_TypeDef

*PCU;

#endif /*PCU*/

...

#endif

When debug mode is used, PCU pointer is initialized in the file 71x_lib.c:

#ifdef _PCU

#define PCU

((PCU_TypeDef *)PCU_BASE)

#endif /*PCU*/

In debug mode, _PCU must be defined, in the file 71x_conf.h, to access the peripheral

registers as follows:

#define _PCU

Some PCU functions use the RCCU and the XTI registers and functions, _RCCU and _XTI

must be defined in 71x_conf.h file to make the RCCU and the XTI functions accessible:

#define _RCCU

#define _XTI

Table 4.

PCU structure fields

Description

MDIVR

CPU frequency division factor

PDIVR

APB frequency division factor

RSTR

Peripheral Reset Control Register

PLL2CR

PLL2 Control Register

BOOTCR

Boot Configuration Register

PWRCR

Power Control Register

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