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AN2260 Datasheet(PDF) 6 Page - STMicroelectronics |
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AN2260 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 10 page 2 UART SystemMemory boot mode AN2260 6/10 2 UART SystemMemory boot mode 2.1 UART SystemMemory code sequence After SystemMemory mode is entered and the STR73x is configured as described above, the SystemMemory code begins to scan the RXD0 line, waiting to receive a zero byte (one start bit, eight '0' data bits, and one stop bit). The duration of this zero byte is measured using the Timer Base 0. The count value of the timer is then used to calculate the corresponding baud rate factor with respect to the current system clock. Next, the code initializes the serial interface accordingly, and sets up pin TXD0 to an alternate function, push-pull output. Using this calculated baud rate, an acknowledge byte is returned to the host which signals that the STR73x is ready to receive the 128 bytes of download data. Note: The watchdog timer is disabled during SystemMemory Mode, so the boot loading sequence is not time limited. Note: The acknowledge byte is 0x95 for the STR73x devices. Figure 2. UART0 SystemMemory boot sequence (1) Reset Stabilization & Code Initialization Time ( > 2ms) (2) Zero Byte Reception (3) Acknowledge Byte Transmission (4) 128 Byte Loader Download 1 2 3 4 RSTIN M1 RX TX Reset SystemMemory UART branch Downloaded Code SysMemory Code Code 128 Byte transfer |
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