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參數(shù)資料
| 型號： | ST6397 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
| 中文描述： | 8位微控制器HCMOS電視頻率合成帶OSD |
| 文件頁數(shù)： | 50/68頁 |
| 文件大小： | 560K |
| 代理商： | ST6397 |
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D6.
Thisbit is fixed to “0”.
C5-C0.
Character type. The 6 character type bits
define one of the 64 available character types.
These charactertypes are shown on the following
pages.
Character Types
The character set is user defined as ROM mask
option.
Register and RAM Addressing
The OSDcontainsseven registers and80 RAM lo-
cations. The seven registers are the Vertical Start
Address register, Horizontal Start Address regis-
ter, Vertical Space register, Horizontal Space reg-
ister, Background Control register, Global Enable
register and Character Bank Select register. The
Global Enable register can be written at any time
by the ST639x Core. The other six registers and
the RAM can only be read or written to if the global
enable is zero.
The six registers and the RAM are located on two
pages ofthe paged memory of the ST639xMCUs;
the Character Bank Select register is located out-
side the paged memory at address EDh. Each
page contains 64 memory locations. This paged
memory is at memory locations 00h to 3Fh in the
ST639x memory map. A page of memory is en-
abled bysettingthe desired pagebit,located inthe
Data Ram Bank Register, to a one. The page reg-
ister is locationE8h. A one in bit five selects page
5, located on the OSD and a one in bit 6 selects
page 6on the OSD. Table12 showstheaddresses
of the OSD registers and RAM.
Table 12. OSD Control Registers and Data
RAM Addressing
Page
Address
Register or RAM
5
00h - 3Fh
RAM Locations 00h - 3Fh
6
00h - 0Fh
RAM Locations 00h - 0Fh
6
10h
Vertical Start Register
6
11h
Horizontal Start Register
6
12h
Vertical Space Register
6
13h
Horizontal SpaceRegister
6
14h
Background Control Register
6
17h
Global EnableRegister
No
Page
EDh
Character Bank Select Register
OSDGlobal Enable Register
This registercontainsthe global enable bit(GE). It
is the only register that can be written at any time
regardless of the state of the GE bit. It is a write
only register.
D7-D1.
Thesebits are not used
GE.
Global Enable. This bit allows the entire dis-
play to be turned off.
“0” - The entire display is disabled.The RAM and
other registersof the OSD canbe accessed by
the Core.
“1” -Display of words is controlled by the word en-
able bits (WE) located in the format or space
character. The other registers and RAM can-
not be accessed by theCore.
ON-SCREEN DISPLAY
(Continued)
Figure58. DisplayCharacter Register
Explanation
Display Character
See Data RAM Table Description
for specific Addresses
( Write Only)
D7 D6 D5 D4 D3 D2 D1 D0
C5-C0 = CharacterTypes
controlBit
Fixed to “0”
Unused
Global Enable
Register
17h - Page6
( Write Only)
D7 D6 D5 D4 D3 D2 D1 D0
GE = Global Enable Bit
Unused
Figure 59. Global EnableBit
ST6391,92,93,95,97,99
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