upd6461 Renesas Electronics Corporation., upd6461 Datasheet - Page 21

• Manufacturer Part Number: upd6461
• Description: Cmos Lsi Chip For Camcorder On-screen Character Display 12 Rows X 24 Columns
• Manufacturer: Renesas Electronics Corporation.

2.3 POWER-ON CLEAR FUNCTION
PCL pin low for the time shown below to allow the system to initialize. This power-on clear places the system in the following
state:
• Test mode is not specified.
• All character data in video RAM (12 rows × 24 columns) is cleared (to display-off data (FEH: µ PD6461/7EH: µ PD6462)) and
• The video RAM write address is (row 0, column 0).
• The character size is single (minimum) for all rows.
• The output distribution format is set to the default (the V
• Display is turned off and LC oscillation is turned on.
The time required for power-on clear is calculated as follows. No commands must be input during this time.
A dot clock input (to the OSC
selected.
The internal state of the IC is unstable immediately after the power is turned on. It is therefore necessary to keep the
blinking is turned off.
Time required for power-on clear = t
Note Refer to POWER-ON CLEAR SPECIFICATIONS in 6. ELECTRICAL CHARACTERISTICS.
IN
pin) is necessary to clear video RAM. Input a dot clock when an external clock input is
= 10( µ s) + {10( µ s) + 12/f
f
PCLL
OSC
(MHz) : LC oscillation frequency or external clock frequency
Note
+ {Time required for clearing video RAM}
Data Sheet S13320EJ2V0DS
OSC
(MHz) × 288}
C1
and V
C2
bits are set to 0).
µ PD6461, 6462
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