mc68hc908ld64 Freescale Semiconductor, Inc, mc68hc908ld64 Datasheet - Page 276

• Manufacturer Part Number: mc68hc908ld64
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

On-Screen Display (OSD)
18.6 OSD Screen Memory Map
Data Sheet
276
The OSD operating screen is mapped to a 1K-byte RAM array from
$0800 to $0BFF. The array is organized as 16 rows by 32 columns, with
two bytes (16-bit) for each row-column location.
OSD screen memory map.
The area covering row0-column0 and row14-column29 are called the
active display registers. Each 16-bit display register defines the
character to be displayed, with an character code (character from font
memory) and an attribute code for that character. Column30 of each row
is the attribute register for the entire row. Row15 registers (not memory
mapped) are used for control, window, and pattern for the entire OSD
screen. See
The CPU have direct access to the all screen memory registers ($0800
to $0BFF) when the OSDMEN bit in the OSD control register is clear.
When the OSD circuitry is displaying the characters (OSDMEN=1),
updates to display is by indirectly writing to these registers. The OSD
data registers, row register, column register are used for this purpose.
See
Row Address Register
Register
DISPLAY RAM
$8C0
$9C0
$A00
$A40
$A80
$AC0
$B00
$B40
$B80
$840
$880
$900
$940
$980
NOT MAPPED
ADDRESS
18.7.3 OSD Data Registers
–
–
–
–
–
–
–
–
–
–
–
–
–
–
$8BF
$9BF
$A3F
$A7F
$ABF
$AFF
$B3F
$B7F
$BBF
$87F
$8FF
$93F
$97F
$9FF
COLUMN
(OSDCAR).
Figure 18-4. Memory Map of OSD Registers
ROW
18.8 OSD Registers
On-Screen Display (OSD)
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
A = Character ATTRIBUTE
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
0
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
C O N T R O L , W I N D O W , A N D P A T T E R N R E G I S T E R S
1
(OSDRAR), and
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
R E G I S T E R S
2
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
D I S P L A Y
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
(OSDDRH:OSDDRL),
C = Character CODE
3
for register definitions.
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
18.7.5 OSD Column Address
MC68HC908LD64
Figure 18-4
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Freescale Semiconductor
28
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
29
18.7.4 OSD
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
shows the
30
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Rev. 3.0
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