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ST10F273Z4 Datasheet(PDF) 44 Page - STMicroelectronics

Part # ST10F273Z4
Description  16-bit MCU with 512 Kbyte Flash memory and 36 Kbyte RAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F273Z4 Datasheet(HTML) 44 Page - STMicroelectronics

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Bootstrap loader
ST10F273Z4
44/188
6
Bootstrap loader
ST10F273Z4 implements Boot capabilities in order to:
Support bootstrap via UART or bootstrap via CAN for the standard bootstrap.
Support a selective bootstrap loader, to manage the bootstrap sequence in a different
way.
6.1
Selection among user-code, standard or selective bootstrap
The boot modes are 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.
Decoding of reset configuration (P0L.5 = 1, P0L.4 = 1) will select the normal mode
(also called User mode) and select the user Flash to be mapped from address
00’0000h.
Decoding of reset configuration (P0L.5 = 1, P0L.4 = 0) will select 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 accesses).
Decoding of reset configuration (P0L.5 = 0, P0L.4 = 1) will activate new verifications to
select which bootstrap software to execute:
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 in the user Flash, then the
User key location is read again. Its value will determine which communication
channel will be enabled for bootstraping.
6.2
Standard bootstrap loader
After entering the standard BSL mode and the respective initialization, the ST10F273Z4
scans the RxD0 line and the CAN1_RxD line to receive either a valid dominant bit from CAN
interface, or a start condition from UART line.
Start condition on UART RxD: ST10F273Z4 starts standard bootstrap loader. This
bootstrap loader is identical to other ST10 devices (example: ST10F269, ST10F168).
Valid dominant bit on CAN1 RxD: ST10F273Z4 start bootstrapping via CAN1.
Table 27.
ST10F273Z4 boot mode selection
P0.5
P0.4
ST10 decoding
11
User mode: user Flash mapped at 00’0000h
10
Standard bootstrap loader: User Flash mapped from 00’0000h, code fetches
redirected to Test-Flash at 00’0000h
01
Selective boot mode: User Flash mapped from 00’0000h, code fetches
redirected to Test-Flash at 00’0000h (different sequence execution in respect of
Standard Bootstrap Loader)
00
Reserved


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