Directed Electronics 3200HS Technical Information PDF herunterladen (Seite 22)

CSI to SPI Peripheral Communication in V850ES Microcontrollers

which determines where the program will begin on a hardware reset and provides initial setup of

system registers before calling the main() function.

When Applilet is used to generate a C program for the V850ES MCU, the crte.s startup assembly

language file is automatically generated, and includes a call to the Clock_Init() function to set the

system clock, and a call to the SystemInit() function which in turn calls initialization routines for

some (but not all) peripherals.

Figure 11. crte.s Startup File

Crte.s

RESET

System Register Init

CALL Clock_Init( )

other initialization

CALL SystemInit( )

CALL main( )

Clock_Init( )

Set PCC and PLL

SystemInit( )

CALL Port_Init( )

CALL TM00_Init( )

After the SystemInit() function finishes, the startup code calls the main() function of the user program.

So at the start of the main() function, peripheral initialization has been done for several peripherals. The

main() function does not need to call these individual peripheral initialization routines.

Note that SystemInit() does NOT automatically call the CSI00_Init() routine to initialize the CSI00

peripheral.

2.6.2 Main( ): Main Program for NEC Electronics CSI to SPI Serial Communication

The main( ) program is called from the startup code after peripheral initialization. The program

calls routines to initialize input switch handling and LED output.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 98 99

Keine Kommentare

Directed Electronics 3200HS Technical Information Seite 22