ST92185B2 datasheet(133/178 Pages) STMICROELECTRONICS

133 / 178 page

133/178

ST92185B - 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

ST92185B2 Datasheet(PDF) 133 Page - STMicroelectronics

ST92185B2 Datasheet(HTML) 133 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL