HCS08 datasheet(59/290 Pages) MOTOROLA

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Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

MC9S08GB/GT

SEC01:SEC00 — Security State Code

This 2-bit field determines the security state of the MCU as shown in Table 4-7. When the MCU is

secure, the contents of RAM and FLASH memory cannot be accessed by instructions from any

unsecured source including the background debug interface. For more detailed information about

security, refer to 4.5 Security.

SEC01:SEC00 changes to 1:0 after successful backdoor key entry or a successful blank check of FLASH.

4.6.3 FLASH Configuration Register (FCNFG)

Bits 7 through 5 may be read or written at any time. Bits 4 through 0 always read 0 and cannot be written.

KEYACC — Enable Writing of Access Key

This bit enables writing of the backdoor comparison key. For more detailed information about the

backdoor key mechanism, refer to 4.5 Security.

1 = Writes to NVBACKKEY ($FFB0–$FFB7) are interpreted as comparison key writes.

Reads of the FLASH return invalid data.

0 = Writes to $FFB0–$FFB7 are interpreted as the start of a FLASH programming or erase

command.

4.6.4 FLASH Protection Register (FPROT and NVPROT)

During reset, the contents of the nonvolatile location NVPROT is copied from FLASH into FPROT. Bits

0, 1, and 2 are not used and each always reads as 0. This register may be read at any time, but user program

writes have no meaning or effect. Background debug commands can write to FPROT.

Table 4-7 Security States

SEC01:SEC00

Description

0:0

secure

0:1

secure

1:0

unsecured

1:1

secure

Bit 7

54321

Bit 0

Read:

KEYACC

00000

Write:

Reset:

000000

= Unimplemented or Reserved

Figure 4-6 FLASH Configuration Register (FCNFG)

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