AN413 datasheet(28/45 Pages) STMICROELECTRONICS

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Examples of ST9 peripheral configurations

AN413

28/45

Doc ID 1875 Rev 2

;**************************************************************

;*Configuration of TIMER 0 I/O pins and A/D Converter I/O pins*

proc INIT_IO [PPR] {

;.............

;............. P3.0 (T0INA) P3.2 (T0INB) INPUT TRISTATE TTL

;............. P3.1 (T0OUTA) P3.3 (T0OUTB) OUTPUT ALTERNATE FUNCTION

PUSH_PULL TTL

spp #P3C_PG

; Port 3 control register page

ld P3C0R,#00001111b

ld P3C1R,#00001010b

ld P3C2R,#00000101b

;............. end of init. P3

;............. INITIALIZATION OF A/D CONVERTOR INPUTS

;............. P4.7 (AIN7) ALTERNATE FUNCTION OPEN DRAIN TTL

;............. P4.6 (AIN6) ALTERNATE FUNCTION OPEN DRAIN TTL

spp #P4C_PG

; Port 4 control register page

ld P4C0R,#11000000b

ld P4C1R,#11000000b

ld P4C2R,#11000000b

;............ end of init. P4

;............ INITIALIZATION OF SCI I/O

; P70: Input = Sin.

; P71: AF = Sout.

; P72: AF = Txclck.

; P73: AF = Rxclck.

spp #P7C_PG

; Port 7 control page.

ld P7C0R,#00001111b ; bit 0 (Sin): IN, TRI, TTL.

ld P7C1R,#11111110b ; bit 1,2,3 (Sout, Txck, Rxck): AF,PP,TTL.

ld P7C2R,#00000001b ; Others : OUT,PP,TTL.

}

;*********************************************

;*SECTION CODE FOR THE CORE INTERRUPT ROUTINE*

;*********************************************

;_______________

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