Functional description. STMicroelectronics SPC58xNx 32-bit Power Architecture microcontroller, SPC58NN84C3, SPC58NN84E7

Boot Assist Flash (BAF) RM0421

Address offset

0x0000

0x0004

0x0008

0x000C–0x000F

0x0010

0x0014

0x0018–0x00FF

Table 1714. BAF image header

Size (bits) Field description

32

32

32

32

32

SSCM boot record tag

BAF start address

BAF version number

Reserved

Part Clock Jitter Activation Constant

Clock Jitter Activation Constant

Reserved

61.2.1.1 BAF image version

The BAF version is a 32-bit field in the image header starting at address 0x0040_4000. The

32-bit field is explained in Table 1715

.

Field

0:7

8:15

16:31

Table 1715. BAF image version

Description

Major Number: This field contains the major version number for the BAF image

Minor Number: This field contains the minor version number for the BAF image

Reserved

61.2.1.2 Clock Jitter Activation constant

The Clock Jitter Activation constant is a 32-bit flag, but the smallest element in flash that can be programmed is 64 bits, so the first 32 bits are reserved to allow programming of this constant. This 32-bit flag can be programmed by the customer and is used to activate the

Clock Jitter feature that adds clock edge jitter to the baud rate clocks of several communications modules.As part of the BAF startup procedure, BAF copies this constant from flash to the PASS Clock Jitter Enable Register.

Field

0:31

Table 1716. BAF Clock Jitter Activation Constant

Description

Clock Jitter Activation Constant. The initial state of production disable flag is erased - 0xFFFF_FFFF.

This equates to NO clock jitter.

61.3 Functional description

A functional description of the BAF modes is contained in the following sections.

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RM0421 Rev 5