AN2430

General description

17/24

1.5

Exiting SystemMemory boot mode

SystemMemory boot mode must be exited in order to execute a program in a normal User

the BOOT pins (BOOT0 and BOOT1) must be set at the proper levels to enter the desired

user mode. Following the Reset, the STR75x CPU begins executing code from location

0x00000000.

Table 4.

Mode Pin vs. memory mapping

1.6

SystemMemory code program flow

Figure 11.

SystemMemory code program flow

BOOT1

BOOT0

Boot Mode

Aliasing

Note

0

0

Embedded Flash

Embedded Flash sector

B0F0 mapped at 0h

All FLASH sectors

accessible except

SystemMemory sector

1

0

Embedded SRAM

Embedded SRAM mapped

at 0h

-

0

1

SystemMemory

SystemMemory mapped at

0h

-

1

1

External SMI

SMI bank 0 mapped at 0h

-

Start

Falling Edge on

UART0 Rx?

No

Start Timer Base

No

Stop Timer Base

Initialize UART0

Send Acknowledge

Wait for a command

Done

Falling Edge on

UART0 Rx ?

Clear the bit 22 of

the Flash Control

Register (Remap)