ST92195D datasheet(137/249 Pages) STMICROELECTRONICS

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ST92195C/D - ON SCREEN DISPLAY (OSD)

7.4.10 Application Software Examples

Before starting an OSD Display, it is very important to start all the internal clock/timings

To understand the software routines given below, make a thorough study of the chapters on the Reset

and Clock Control Unit (RCCU) and the TDSRAM Interface.

Initialization of the Internal Clock

;=========================================================================

;

MAIN CLOCK INIT

;=========================================================================

CLOCKS::

;--------- CPU MAIN CLOCK ------------

; C K M A I N

provided by the freq. multplier

spp #TCCR_PG; Timings & clock Controller registers page

; page 39 or 27

ld MCCR,#0x05; program the frequency multiplier down

; counter in the feed-back loop (253 =FD)

; freq=(5+1)*2 =12Mhz

; freq=(7+1)*2 =16Mhz

; freq=(8+1)*2 =18Mhz

ld MCCR,#0x85; enable the freq. multiplier

srp #BK20

ldw rr0,#0x2FFF;

time_stab1:

; for frequency multiplier stabilization

decw rr0; change CPU source clock & wait clock stabilization

cpw rr0,#0x00;

jxnz time_stab1;

ld MCCR,#0xC5 ; select the freq. multiplier as main clock

pop ppr

;=========================================================================

;

SYNCHRO START

;=========================================================================

spp #SYCR_PG

; set page pointer to page 23h or 35 decimal

ld CSYCTR,#000h; R243, Hsync and Vsync from deflection part

(external)

ld CSYSUR,#0C4h; R242 Sync Controller Set-up register

; Standard mode, Positive polarity of Hsync & Vsync

; delay on Hsync/Vsync HSF(3:0)=9

;=========================================================================

;

DISPLAY PIXEL CLOCK

;=========================================================================

;

spp #TCCR_PG; Timings & clock Controller registers page

; set page pointer to page 39 decimal

ld SKCCR, #0x09; FE, Skew clock control register

; program the frequency multiplier down

; counter in the feed-back loop

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