W78C354 Datasheet, PDF (34/44 Pages) Winbond – MONITOR MICROCONTROLLER

W78C354
The relations between the bit DUMMYEN and the outputs of the H/V frequencies are listed below:
HOUT
VOUT
DUMMYEN = 0
HREST
VREST (if ENVS = 0)
VSEP (if ENVS = 1)
DUMMYEN = 1
HDUMMY
VDUMMY
M-5. H-clamp Pulse Generator
If the P14SF bit is set in the newly added SFR CONTREG4 (bit-addressable), the output pin P1.4 can
be used as the H-clamp pulse output (refer to Figure 13). The Hsync trigger type can be selected to
generate the H-clamp output pulse, and the pulse width of the H-clamp output can be determined by
programming the bits HCES, HCWS1, and HCWS2 in SFR CONTREG1. For details, see the
following figure and description.
CONDITION Of P14SF
PORT 1.4 I/O PIN FUNCTION
P14SF = 0
General I/O pin
P14SF = 1 & P1.4 = 0
H-clamp pulse output
P14SF
P1.4 output latch
0
H-Clamp pulse
1
P1.4/HCLAMP
Figure 13. Alternate function of P1.4
1. Select the leading edge or trailing edge of Hsync:
• HCES = 0: select leading edge
• HCES = 1: select trailing edge
- 34 -