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(3) ROM
1
Outline
A. Program ROM (IC314)
B. Data ROM (IC315)
C. GROM (IC309) for storing graphic data
D. CGROM (IC305) for storing character data
2
Pin arrangement (IC314)
1
2
3
4
5
6
7
27C512
8
9
1 0
11
12
1 3
1 4
3
ROM output signals (IC314)
Pin
Signal
IN/OUT
NO.
name
1
IN
A15
Address signal
2
IN
A12
Address signal
3
A7
*
*
IN
Address signal
10
A0
11
D0
*
*
OUT
Data signal
13
D2
14
—
GND
GND (0V)
15
D3
*
*
OUT
Data signal
19
D7
ROM chip enable signal. At LOW
20
IN
CE
(0V), ROM data output enable.
21
IN
A10
Address signal
Data output enable signal. At LOW,
22
IN
OD
ROM data are sent to the CPU.
23
IN
A11
Address signal
24
IN
A9
Address signal
25
IN
A8
Address signal
26
IN
A13
Address signal
27
IN
A14
Address signal
28
—
5V
Power source
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Function
9 – 19
(4) Outline of LCD display control operations
1
The CPU receives image data from the main body. (Besides, the
key LED data are received.)
2
With the received image data (corresponding to the data ROM
address), the character data of the data ROM (corresponding to
CG-ROM address) and graphic data (corresponding to G-ROM
address) are read.
CG-ROM...... Character storing ROM
G-ROM ........ Graphic storing ROM
3
The upper address and the lower address of the CG-ROM and the
G-ROM corresponding to characters and graphic are written into
the image areas of two V-RAM's.
Inversion and blink data corresponding to characters are written
into the A-RAM (attribute RAM).
4
The LCTC (LCD controller) the LCTC (LCD controller), by using
the G-ROM and the CG-ROM, allows to stock image dato of
several screens in the V-RAM.
5
The read image data are transferred to the LCD unit.
6
The LCD contrast is controlled by the thermistor.
7
Communication with the operation PWB
8
Interfaces the communication between Zaurus and the PCU PWB.
LCD display control section block diagram
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