W78C354 Datasheet, PDF (35/44 Pages) Winbond – MONITOR MICROCONTROLLER

W78C354
(a) Negative polarity Hsync
Hsync
(b) Postive polarity Hsync
Hsync
P1.4
(Leading-edge)
P1.4
(Trailing-edge)
P1.4
(Leading-edge)
P1.4
(Trailing-edge)
Figure 14. Pin P1.4 outputs the H-clamp pulse at the leading edge or trailing edge of Hsync.
2. Pulse width of H-clamp pulse:
• Select the weighting of H-clamp pulse by programming bits HCWS0 and HCWS1 in CONTREG1
• Pulse width of H-clamp output: [(1/FCLOCK) × Weighting] ± [ 1/(2 × FCLOCK)]
(HCWS1, HCWS0) WEIGHTING
16 MHz
18.432 MHz
20 MHz
(0, 0)
4.5
281 ±31 nS
244 ±27 nS
225 ±25 nS
(0, 1)
8.5
531 ±31 nS
461 ±27 nS
425 ±25 nS
(1, 0)
16.5
1031 ±31 nS
896 ±27 nS
825 ±25 nS
(1, 1)
32.5
2031 ±31 nS
1764 ±27 nS
1625 ±25 nS
Hsync
H-clamp
output
Figure 15. Pulse width of H-clamp output
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Publication Release Date: October 1996
Revision A1