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參數(shù)資料
| 型號： | M37225MC-XXXSP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42 |
| 文件頁數(shù)： | 84/128頁 |
| 文件大?。?/td> | 1481K |
| 代理商： | M37225MC-XXXSP |
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M37225M6/M8/MA/MC-XXXSP, M37225ECSP
Rev.1.00
Nov 01, 2000
page 57 of 124
REJ03B0136-0100Z
(1) Clock for OSD
As a clock for display to be used for OSD, it is possible to select one
of the following 3 types.
Main clock from the pins XIN and XOUT
Clock from the LC or RC oscillator supplied from the pins OSC1
and OSC2
Clock from the ceramic resonator or the quartz-crystal oscillator
from the pins OSC1 and OSC2
The clock for display to be used for OSD can be selected by bits 0
and 1 of the interrupt input polarity register (address 00CD16).
And besides, when selecting main clock, set the oscillation frequency
to 8 MHz.
Fig. 8.10.5 Interrupt Input Polarity Register
b7 b6 b5 b4 b3 b2 b1 b0
Interrupt input polarity register (IP) [Address 00CD16]
b
Name
Function
After reset R W
Interrupt Input Polarity Register
0
INT1 polarity
switch bit (POL1)
2
3
4
5
0 : Positive polarity
1 : Negative polarity
6, 7
0
R W
0
R W
0
R W
INT2 polarity
switch bit (POL2)
INT3 polarity
switch bit (POL3)
Fix these bits to “0.”
0
W
R
0
W
R
0, 1 OSD clock
selection bits
(OCG0, OCG1)
0
R W
Since the main clock is used as the
clock for OSD, the oscillation
frequency is limited. Because of
this, the character size in width
(horizonal) direction is also limited.
In this case, pins OSC1 and OSC2
are also used as input ports P33
and P34 respectively.
The clock for OSD is supplied by connecting the
following across the pins OSC1 and OSC2.
However, it is not corresponding to the bi-scan
mode.
a ceramic resonator only for OSD and a
feedback resistor
a quartz-crystal oscillator only for OSD and a
feedback resistor
b1
The clock for OSD is supplied by connecting RC
or LC across the pins OSC1 and OSC2. However,
it is not corresponding to the bi-scan mode.
Function
00
b0
OSD
oscillation
frequency =
f(XIN)
0
1
11
The clock for OSD is supplied by connecting LC
across the pins OSC1 and OSC2. In the bi-scan
mode, be sure to set this.
Fix this bit to “0.”
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0
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