W78C354 Datasheet, PDF (37/44 Pages) Winbond – MONITOR MICROCONTROLLER

W78C354
No Hsync response time
16 MHz
128 µS
18.432 MHz
111 µS
20 MHz
102 µS
M-7. Self-test Pattern Output
When the dummy frequency generator is enabled, if bit P23SF of SFR CONTREG4 is set, the STP
output will provide a checkerboard pattern for burn-in or self-diagnostic purposes. The bit INVSTP of
CONTREG4 can invert the checkerboard pattern to avoid phosphor damage during factory burn-in.
CONDITION Of P23SF
PORT 2.3 I/O PIN FUNCTION
P23SF = 0
General I/O pin
P23SF = 1 & P2.3 = 0
STP output
P23SF
P2.3 output latch
0
STP output
1
P2.3/STP
Figure 18. Alternate function of P2.3
INVSTP = 0
INVSTP = 1
Figure 19. Checkerboard pattern
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Publication Release Date: October 1996
Revision A1