Samsung S3C2440A - Manual (Page 487)

S3C2440A RISC MICROPROCESSOR CAMERA INTERFACE
23-9
TIMING DIAGRAM FOR LAST IRQ
IRQ except LastIRQ is generated before image capturing. Last IRQ which means capture-end can be set by
following timing diagram. LastIRQEn is auto-cleared and ,as mentioned, SFR setting in ISR is for next frame
command. So, for adequate last IRQ, you should follow next sequence between LastIRQEn and ImgCptEn
/ImgCptEn_CoSc /ImgCptEnPrSC. It is recommended that ImgCptEn /ImgCptEn_CoSc /ImgCptEnPrSC are set at
same time and at last of SFR setting in ISR. FrameCnt which is read in ISR, means next frame count. On following
diagram, last captured frame count is “1”. That is, Frame 1 is the last-captured frame among frame 0~3. FrameCnt
is increased by 1 at IRQ rising.
pzyG™ŒŽ–• pzyG™ŒŽ–• pzyG™ŒŽ–•
}z€uj
pzyG™ŒŽ–•
p”Žj—›l•OŠ”‹P
sˆš›pyxl•
jˆ—›œ™ŒGv jˆ—›œ™ŒGv jˆ—›œ™ŒGv jˆ—›œ™ŒG
pyx
hœ›–GŠ“Œˆ™Œ‹
sˆš›Gpyx
pzyG™ŒŽ–• pzyG™ŒŽ–• pzyG™ŒŽ–•
m™ˆ”Œj•›
W X Y Z Z W X
jˆ—›œ™ŒGv jˆ—›œ™ŒGv
Om™ˆ”Œ†ZP Om™ˆ”Œ†ZP Om™ˆ”Œ†ZP Om™ˆ”Œ†ZP Om™ˆ”Œ†WP Om™ˆ”Œ†WP Om™ˆ”Œ†WP Om™ˆ”Œ†WP Om™ˆ”Œ†XP Om™ˆ”Œ†XP Om™ˆ”Œ†XP Om™ˆ”Œ†XP Om™ˆ”Œ†ZP Om™ˆ”Œ†ZP Om™ˆ”Œ†ZP Om™ˆ”Œ†ZP Om™ˆ”Œ†WP Om™ˆ”Œ†WP Om™ˆ”Œ†WP Om™ˆ”Œ†WP
Figure 23-9 Timing diagram for last IRQ