UPD6462 NEC, UPD6462 Datasheet - Page 22

• Manufacturer Part Number: UPD6462
• Description: CMOS LSI CHIP FOR CAMCORDER ON-SCREEN CHARACTER DISPLAY 12 ROWS x 24 COLUMNS
• Manufacturer: NEC

22
3. COMMAND DETAILS
3.1 VIDEO RAM BATCH CLEAR COMMAND
first and LSB-first transfer).
being cleared.
is selected.
(MSB)
D7
This command clears the entire video RAM by means of a single operation (the bit configuration is the same as for MSB-
The video RAM batch clear command places the system in the following state:
• All character data in video RAM (12 rows
• 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 clearing video RAM is calculated as follows. No command must be input while the video RAM is
A dot clock input (to the OSC
Remark Power-on clear using the PCL pin is hardware reset, initializing the IC, including clearing the video RAM and
0
PD6462)) and blinking is turned off.
D6
0
releasing test mode. The video RAM batch clear command, in contrast, performs software reset by initializing
the IC without first releasing test mode.
D5
0
D4
0
Time required to clear video RAM = 10( s) + 12/f
D3
0
IN
pin) is necessary to clear the video RAM. Input a dot clock when external clock input
D2
0
f
OSC
D1
(MHz) : LC oscillation frequency or external clock frequency
0
(LSB)
D0
0
24 columns) is cleared (to display-off data (FEH:
C1
and V
C2
OSC
bits are set to 0).
(MHz)
288
PD6461, 6462
PD6461/7EH: