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ST72589BW Datasheet(PDF) 42 Page - STMicroelectronics

Part # ST72589BW
Description  8-BIT MCU WITH NESTED INTERRUPTS, DOT MATRIX LCD, ADC, TIMERS, PWM-BRM, SPI, SCI, I²C, CAN INTERFACES
PDF  158 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72589BW Datasheet(HTML) 42 Page - STMicroelectronics

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7 ON-CHIP PERIPHERALS
7.1 LCD DRIVER
7.1.1 Introduction
The LCD driver controls up to 60 segments and 8
backplanes to drive up to 60x8 (480) or 60x4(240)
LCD segments.
Two programmable display modes (1/4 and 1/8
duty cycle) with 4 LCD drive frequencies can be
selected by software.
The parameters to display are stored in a 60-byte
LCD dual port RAM.
Four different main oscillator clocks can be select-
ed as clock for the peripheral.
– 8, 4, 2, 1 MHz fCPU software selectable.
The peripheral can be switched off by software to
reduce the power consumption while it is not used.
Figure 25. LCD Frequency Generator Block Diagram
7.1.2 Voltage references
The display voltage levels are supplied by an ex-
ternal resistor chain as shown in Figure 26 This
LCD driver needs 5 external voltage references
through 5 pins (GLCD, 1/4VLCD, 1/2VLCD,
3/4VLCD, VLCD).
The resistors used must have good tolerance
matching within 1% to avoid DC voltage levels on
the liquid crystal device. DC levels trigger elec-
trode reactions in the liquid crystal cell, causing a
rapid deterioration of the display quality.
Note: To avoid damaging the device, VLCD supply
voltages must always be supplied with more than
VDD or they have to be left unconnected.
Figure 26. LCD External Supply Network
CLOCK
DIVIDER
fFR
fLCDin ≈ 16KHz
fCPU
fLCD ≈ 0.5...2KHz
DIV 8,16,24,32
DCS
0
CD1
CD0 LCDE
0
FS1
FS0
CR
BACKPLANE
MUX
MAIN
OSCILLATOR
(SEG, COM)
RLCD1
VLCD
EXTERNAL VLCD
3/4VLCD
1/2VLCD
1/4VLCD
GLCD
RLCD2
RLCD3
RLCD4
CLCD1
CLCD2
CLCD3



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