ST10F276Z5 STMicroelectronics, ST10F276Z5 Datasheet - Page 47

• Manufacturer Part Number: ST10F276Z5
• Description: 16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
• Manufacturer: STMicroelectronics

Specifications of ST10F276Z5

• Single Voltage Supply: 5V ±10% (embedded regulator for 1.8 V core supply)

ST10F276Z5
5
5.1
Bootstrap loader
The ST10F276Z5 features innovative boot capabilities in order to support:
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Selection among user-code, standard or alternate bootstrap
The selection among user-code, standard bootstrap or alternate bootstrap is made by
special combinations on Port0L[5...4] during the time the reset configuration is latched from
Port0.
The alternate boot mode is triggered with a special combination set on Port0L[5...4]. Those
signals, as other configuration signals, are latched on the rising edge of RSTIN pin.
The alternate boot function is divided in two functional parts (which are independent from
each other):
Part 1: Selection of reset sequence according to the Port0 configuration -
User mode and alternate mode signatures
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Part 2: Running of user selected reset sequence
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User defined bootstrap (see Alternate bootstrap loader)
Bootstrap via UART or bootstrap via CAN for the standard bootstrap
Decoding of reset configuration (P0L.5 = 1, P0L.4 = 1) selects the normal mode and
the user Flash to be mapped from address 00’0000h.
Decoding of reset configuration (P0L.5 = 1, P0L.4 = 0) selects ST10 standard bootstrap
mode (Test-Flash is active and overlaps user Flash for code fetches from address
00'0000h; user Flash is active and available for read and program).
Decoding of reset configuration (P0L.5 = 0, P0L.4 = 1) activates new verifications to
select which bootstrap software to execute:
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Standard bootstrap loader: Jump to a predefined memory location in Test-Flash
(controlled by ST)
Alternate boot mode: Jump to address 09’0000h
Selective bootstrap loader: Jump to a predefined location in Test-Flash (controlled by
ST) and check which communication channel is selected
User code: Make a software reset and jump to 00’0000h
If the user mode signature in the user Flash is programmed correctly, then a
software reset sequence is selected and the user code is executed;
If the user mode signature is not programmed correctly but the alternate mode
signature in the user Flash is programmed correctly, then the alternate boot mode
is selected;
If both the user and the alternate mode signatures are not programmed correctly
in the user Flash, then the user key location is read again. Its value will determine
the behavior of the selected bootstrap loader.
Bootstrap loader
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