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參數資料
| 型號： | 935165940112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 畫面疊加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDSO24 |
| 封裝： | PLASTIC, SOT-137-1, SO-24 |
| 文件頁數： | 6/66頁 |
| 文件大小： | 445K |
| 代理商： | 935165940112 |
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1995 Jan 19
14
Philips Semiconductors
Preliminary specication
Stand-alone OSD
PCA8515
8.2
Loading character data into display RAM
Three registers are used to address and load data into the
display RAM. These registers are described below.
8.2.1
DCR ADDRESS REGISTER (DCRAR)
Table 5
DCR Address Register
This register holds the address of the location in display
RAM into which data is to be written. Command 3 loads
the High nibble of the address into this register;
Command 4 loads the Low nibble of the address.
8.2.2
DCR ATTRIBUTE REGISTER (DCRTR)
Table 6
DCR Attribute Register
The Attribute Register is loaded with character font
attribute data using Command 2. The data will be loaded
into bits <4-0> of the location in RAM addressed by the
contents of DCRAR. Bits 7 to 5 are not used and are
reserved.
8.2.3
DCR CHARACTER REGISTER (DCRCR)
Table 7
DCR Character Register
This register holds the character font data loaded by
Command 1. The data will be loaded into bits <12-5> of
the location in RAM addressed by the contents of DCRAR.
76543210
A7
A6
A5
A4
A3
A2
A1
A0
76543210
T4
T3
T2
T1
T0
76543210
C7
C6
C5
C4
C3
C2
C1
C0
8.3
Writing character data to display RAM
The procedure for writing character data to the display
RAM is as follows:
1. Select the start address in display RAM. The start
address can take any value between 0 and 255.
Command 3 is used to load the High nibble of the start
address. Command 4 is used to load the Low nibble of
the start address. The start address is stored in
DCRAR.
2. Load the character attributes into DCRTR using
Command 2. The actual attribute selected is
dependent upon whether the Character Font Code,
Carriage Return Code or Space Code has been
selected by Command 1 (see Section 8.1).
If the attributes of a series of displayed characters are
the same, the contents of this register need not be
updated.
3. Load the Character Font data into DCTCR using
Command 1 or Command 5. Either of these
commands signal that a complete command byte is
available and the data held in registers DCRTR and
DCRCR is loaded into the RAM location pointed to by
the address stored in DCRAR. The address held in
DCRAR is then incremented by ‘1’ pointing to the next
RAM location in anticipation of the next operation.
A description of all the Commands is given in Chapter 9.
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