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ST10F296 数据表(PDF) 88 Page - STMicroelectronics |
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ST10F296 数据表(HTML) 88 Page - STMicroelectronics |
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88 / 346 page  Obsolete Product(s) - Obsolete Product(s) The bootstrap loader ST10F296E 88/346 6.6.5 Watchdog The watchdog timer remains disabled during both standard and alternate boot mode. If a watchdog reset occurs, a software reset is generated. Note: See note concerning software reset in Section 6.2.7 on page 73. 6.6.6 Exiting alternate boot mode Once the ABM mode is entered, it can be exited only with a software or hardware reset. Note: See note concerning software reset in Section 6.2.7 on page 73. 6.6.7 Alternate boot user software Users can write the software they want to execute in alternate boot user mode if the rules concerning the following items are met: ● Mapping variables ● Disabling interrupts ● Exiting conditions ● Predefining vectors in Block 0 of Bank 2 ● Using the watchdog The starting address is 09’0000h. 6.6.8 User/alternate boot mode signature check To operate user/alternate boot mode, the signature of two memory location contents are calculated and compared to a reference signature. Flash memory locations must be reserved and programmed as follows: User mode signature 00'0000h: Memory address of operand0 for the signature computing 00’1FFCh: Memory address of operand1 for the signature computing 00’1FFEh: Memory address for the signature reference Alternate mode signature 09'0000h: Memory address of operand0 for the signature computing 09’1FFCh: Memory address of operand1 for the signature computing 09’1FFEh: Memory address for the signature reference Correct values for operand0, operand1 and the reference signature allow the sequence in Figure 14 to execute successfully. Figure 14. Reference signature computation MOV Rx, CheckBlock1Addr ; 00’0000h for standard reset ADD Rx, CheckBlock2Addr ; 00’1FFCh for standard reset CPLB RLx ; 1s complement of the lower ;byte of the sum CMP Rx, CheckBlock3Addr ; 00’1FFEh for standard reset Obsolete Product(s) - Obsolete Product(s) |
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