參數(shù)資料
型號(hào)： UPD6462GS
廠商： NEC Corp.
英文描述： CMOS LSI CHIP FOR CAMCORDER ON-SCREEN CHARACTER DISPLAY 12 ROWS x 24 COLUMNS
中文描述： 大規(guī)模集成電路芯片的CMOS攝像機(jī)屏幕字符顯示12行x 24個(gè)欄目
文件頁(yè)數(shù)： 21/60頁(yè)
文件大小： 411K
代理商： UPD6462GS
21
μ
PD6461, 6462
2.3 POWER-ON CLEAR FUNCTION
The internal state of the IC is unstable immediately after the power is turned on. It is therefore necessary to keep the
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
blinking is turned off.
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
C1
and V
C2
bits are set to 0).
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.
Time required for power-on clear = t
PCLL
Note
+ {Time required for clearing video RAM}
= 10(
μ
s) + {10(
μ
s) + 12/f
OSC
(MHz)
×
288}
f
OSC
(MHz) : LC oscillation frequency or external clock frequency
Note
Refer to
POWER-ON CLEAR SPECIFICATIONS
in
6. ELECTRICAL CHARACTERISTICS
.
A dot clock input (to the OSC
IN
pin) is necessary to clear video RAM. Input a dot clock when an external clock input is
selected.
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