AN2260

1 General description

5/10

1.5

SystemMemory code program flow

Figure 1.

SystemMemory code program flow

Figure 1 shows the program flow of the SystemMemory code software. A few points worth

noting are:

●

The boot process will not start if debug protection is active.

●

The UART interface is only initialized if UART boot mode is detected.

Note:

STR73x Timer Base 0 (TB0) is used to automatically detect the serial baud rate.

Start

Debug Protection

Disabled ?

EndLess Loop

No

Falling Edge on

UART0 Rx ?

No

Start Timer Base 0

UART0 Rx == 1?

No

Stop Timer Base 0

Initialize UART0

Send Acknowledge

UART0 Byte

received?

Store Byte in RAM

Increment Address

All Bytes

received?

Jump To Downloaded Code

Done

No

No

at Address = 0xA0000000

Init PLL & IO ports