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PDF SAP1024B Data sheet ( Hoja de datos )
| Número de pieza | SAP1024B | |
| Descripción | Dot Matrix STN LCD Controller | |
| Fabricantes | Avant Electronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SAP1024B (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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DATA SHEETwww.DataSheet4U.com
SAP1024B
Dot Matrix STN LCD
Controller with 1024-byte
Font ROM
To improve design and/or performance,
Avant Electronics may make changes to its
products. Please contact Avant Electronics
for the latest versions of its products
data sheet (v6)
2005 Sep 30
1 page  
Avant Electronics
SAP1024B
Dot Matrix STN LCD Controller with 1024-byte Font ROM
4 FUNCTIONAL BLOCK DIAGRAM AND DESCRIPTION
www.DataSheet4U.com
4.1 Funtional block diagram
(To drivers)
(Display Memory Address Bus)
ad0 ~ ad 15
(Display Memory Data Bus )
d0 ~ d7
LCD Display
Timing Geneartor
LCD Data
Control
Text
Pointer
Graphic
Pointer
Address
Pointer
CG RAM
Pointer
RAM Data
output buffer
RAM Data
Input buffer
Display Control
Display Data
Aribitration
Graphic Data
Buffer
Text Data
Buffer
Timing Control
OSC
Command Interpreter
Status
Command
Decoder
XI XO
Memory Access Address
Control
CG ROM
Character Code
Buffer
Cursor Control
Circuit
Cursor Pointer
Register
Copy Command
Control Circuit
Internal Data Latch
STATUS
Latch
Data
Latch
Instruction
Latch
Data
Latch
Data & Command Control
D0 ~~ D7
(To the address bus of host microcontroller)
WR RD CE C/D
( From host micrcontroller )
Fig.2 Functional diagram
2005 Sep 30
5 of 57
data sheet (v6)
5 Page 
Avant Electronics
SAP1024B
Dot Matrix STN LCD Controller with 1024-byte Font ROM
6 THE RELATIONSHIP BETWEEN NUMBER OF ROW/COLUMN AND OSCILLATION CLOCwKww.DataSheet4U.com
6.1 Caculation of oscillator frequency
The calculation of oscillator frequency is described below:
fOSC: Frequency of oscillation
fSCP: Frequency of shift clock
fR: Frequency of Frame
M: Number of characters on one horizontal row. As the maximun number of dots of each scan line of a character has 8
horizontal dots, total number of dots in a horizontal scan line is 8M.
N: Number of horizontal rows. As the maximum number of each character has 8 dots in vertical direction, the total liner
of scan lines is 8N and the display duty cycle is 1/8N.
Total number of dots per frame= 8M x 8N
Time needed to display a frame= 1/fR = [total number of dots per frame ] x [ period of a dot clock ] = (8M x 8N) x (1/fSCP).
-f-8-S--M-C---P- × 8N = f-1-R--
As fosc= 2 x fSCP, the above equation can be re-written as fosc= fR x 2 x 8M x 8N, where fR is usually 60Hz.
The following table gives the oscillator frequency for various combination of M and N, with fR = 60 Hz.
Table 4 Oscillator frequency
M
N
2
4
6
8
10
12
14
16
32
0.492
0.983
0.983
1.966
1.475
2.949
1.966
3.932
2.458
4.915
2.949
5.898
3.440
6.881
3.932
7.864
40
0.614
1.229
1.229
2.458
1.843
3.686
2.458
4.915
3.072
6.144
3.686
7.373
4.300
8.601
4.915
9.830
64
0.983
1.966
1.966
3.932
2.949
5.898
3.932
7.864
4.915
9.830
5.898
11.776
6.881
13.763
7.864
15.729
80
1.229
2.458
2.458
4.915
3.686
7.372
4.915
9.830
6.144
12.288
7.373
14.746
8.602
17.203
9.830
19.660
DUTY
1/16
1/32
1/48
1/64
1/80
1/96
1/112
1/128
Note:
1. The upper cell with yellow shading is for single scan.
2. The lower cell without yellow shading is for dual scan.
3. The frame frequency (fR) is 60 Hz.
2005 Sep 30
11 of 57
data sheet (v6)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SAP1024B.PDF ] | |
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