ST7533 Sitronix Technology, ST7533 Datasheet - Page 39

• Manufacturer Part Number: ST7533
• Description: 33 x 96 Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

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ST7533
Sleep Mode
This stops all operations in the LCD display system, and as long as there are no accesses from the MPU, the consumption
current is reduced to a value near the static current. The internal modes during sleep mode are as follows:
1. The oscillator circuit and the LCD power supply circuit are halted.
2. All liquid crystal drive circuits are halted, and the segment in common drive outputs output a V
Standby Mode
The duty LCD display system operations are halted and only the static drive system for the indicator continues to operate,
providing the minimum required consumption current for the static drive. The internal modes are in the following states during
standby mode.
1 The LCD power supply circuits are halted. The oscillator circuit continues to operate.
2 The duty drive system liquid crystal drive circuits are halted and the segment and common driver outputs output a V
The static drive system does not operate.
When a reset command is performed while in standby mode, the system enters sleep mode.
* When an external power supply is used, it is recommended that the functions of the external power supply circuit be stopped
NOP
Non-OPeration Command
Test
This is a command for IC chip testing. Please do not use it. If the test command is used by accident, it can be cleared by
applying a “L” signal to the /RES input by the reset command or by using an NOP.
* Inactive bit
Note: The ST7533 maintain their operating modes until something happens to change them. Consequently, excessive external
Ver 1.0
when the power saver mode is started. For example, when the various levels of liquid crystal drive voltage are provided by
external resistive voltage dividers, it is recommended that a circuit be added in order to cut the electrical current flowing
through the resistive voltage divider circuit when the power saver mode is in effect. The ST7533 series chips have a liquid
crystal display blanking control terminal /DOF. This terminal enters an “L” state when the power saver mode is launched.
Using the output of /DOF, it is possible to stop the function of an external power supply circuit.
A0
0
A0
0
noise, etc., can change the internal modes of the ST7533 . Thus in the packaging and system design it is necessary to
suppress the noise or take measure to prevent the noise from influencing the chip. Moreover, it is recommended that the
o p e r a t i n g m o d e s b e r e f r e s h e d p e r i o d i c a l l y t o p r e v e n t t h e e f f e c t s o f u n a n t i c i p a t e d
RD
RD
E
E
1
1
WR
WR
R/W
R/W
0
0
D7 D6 D5 D4 D3 D2 D1 D0
1
D7 D6 D5 D4 D3 D2 D1 D0
1
1
1
1
1
0
1
0
1
0
1
1
*
1
*
39/60
noise.
DD
level.
2003/07/21
DD
level.