Boot Assist Module (BAM)
MPC5606S Microcontroller Reference Manual, Rev. 7
174
Freescale Semiconductor
If public access is not allowed but the flash is not secured, the received password is compared with the
value saved on NVPWD0 and NVPWD1 registers.
In both of the previous cases, comparison is done by the BAM application. If password validation fails,
the BAM pushes the MCU into static mode.
In case of public access not allowed and flash secured, the password is written into the
SSCM.PWCMPH-L registers.
After a fixed waiting time, a comparison is done by hardware. Then the BAM again verifies
SSCM_STATUS’s SEC flag:
•
SEC = 0, flash is now unsecured and BAM continues its task
•
SEC = 1, flash is still secured because password was wrong; BAM puts MCU into static mode
This fixed time depends on the external crystal oscillator frequency (FXOSC). With FXOSC of 12 MHz,
the fixed time is 350 ms.
Figure 6-5. Password check flow
6.5.4.6
Download start address, VLE bit and code size
The next 8 bytes received by the MCU contain a 32-bit start address, the VLE mode bit, and a 31-bit code
length, as shown in
The VLE bit (Variable Length Instruction) is used to indicate for which instruction set the code has been
compiled. This device family supports only VLE = 1. This bit is used for backward compatibility.
Write received password to
SSCM.PWCMPH-L
verify if Flash is
unsecured
SSCM.
STATUS.
PUB
SSCM.
STATUS.
SEC
comparison with
password saved on
NVPWD0-1
=1
=0
=1
=0
Wait
comparison with
0xFEEDFACE
CAFEBEEF
Содержание MPC5602S
Страница 76: ...Overview MPC5606S Microcontroller Reference Manual Rev 7 74 Freescale Semiconductor...
Страница 82: ...Memory Map MPC5606S Microcontroller Reference Manual Rev 7 80 Freescale Semiconductor...
Страница 112: ...Signal Description MPC5606S Microcontroller Reference Manual Rev 7 110 Freescale Semiconductor...
Страница 166: ...Analog to Digital Converter ADC MPC5606S Microcontroller Reference Manual Rev 7 164 Freescale Semiconductor...
Страница 182: ...Boot Assist Module BAM MPC5606S Microcontroller Reference Manual Rev 7 180 Freescale Semiconductor...
Страница 234: ...Clock Description MPC5606S Microcontroller Reference Manual Rev 7 232 Freescale Semiconductor...
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Страница 546: ...Error Correction Status Module ECSM MPC5606S Microcontroller Reference Manual Rev 7 544 Freescale Semiconductor...
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Страница 1258: ...Registers Under Protection MPC5606S Microcontroller Reference Manual Rev 7 1256 Freescale Semiconductor...
Страница 1323: ...Register Map MPC5606S Microcontroller Reference Manual Rev 7 Freescale Semiconductor 1321...
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