ST6246 STMICROELECTRONICS [STMicroelectronics], ST6246 Datasheet - Page 51
ST6246
Manufacturer Part Number
ST6246
Description
8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.ST6246.pdf
(72 pages)
- Current page: 51 of 72
- Download datasheet (453Kb)
LCD CONTROLLER-DRIVER (Continued)
4.5.4 Stand by or STOP operation mode
No clock from the main oscillator is available in
STOP mode for the LCD controller, and the con-
troller is switched off when the STOP instruction is
executed. All segment and common lines are then
switched to ground to avoid any DC biasing of the
LCD elements.
Operation in STOP mode remain possible by
switching to the OSC32KHz, by setting the
HF0..HF2 bit of LCDCR accordingly ( T able 18).
Care must be taken for the oscillator switching that
LCD function change is only effective at the end of
a frame. Therefore it must be guaranteed that
enough clock pulses are delivered before entering
into STOP mode. Otherwise the LCD function is
switched off at STOP instruction execution.
Table 18. Oscillator Source Selection
4.5.5 LCD Mode Control Register (LCDCR)
Address: DCh - Read/Write
Bits 7-6 = DS0, DS1. Multiplexing ratio select bits .
These bits select the number of common back-
planes used by the LCD control.
HF2
0
0
0
1
Others
HF1
0
0
1
1
HF0
0
1
0
1
Clock disabled: Display off
Auxiliary 32KHz oscillator
Reserved
Reserved
Division from MCU f
Division Factor
INT
Bits 5-3 = HF0, HF1, HF2. Oscillator select bits .
These bits allow the LCD controller to be supplied
with the correct frequency when different high
main oscillator frequencies are selected as system
clock. Table 15 shows the set-up for different clock
crystals.
Bits 2-0 = LF0, LF1, LF2. Base frame frequency
select bits. These bits control the LCD base oper-
ational frequency of the LCD common lines.
LF0, LF1, LF2 define the 32KHz division factor as
shown in Table 19.
Table 19. 32KHz Division Factor for Base
Frequency Selection
LF2
DS1
0
0
0
0
1
1
1
1
7
LF1
DS0
0
0
1
1
0
0
1
1
LF0
0
1
0
1
0
1
0
1
HF2
512
386
256
192
128
96
64
Reserved
HF1
32KHz Division Factor
HF0
ST62T46B/E46B
LF2
LF1
51/72
LF0
387
0
Related parts for ST6246
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST62T15C / ST62T25C) 8-BIT OTP/EPROM MCUs WITH A/D CONVERTER
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST62E35B / ST62T35B) 8-BIT OTP/EPROM MCUs
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
8-BIT OTP/EPROM MCU WITH LCD DRIVER / EEPROM AND A/D CONVERTER
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
AUdio Amplifier
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
NPN MEDIUM POWER TRANSISTOR
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST90135 / ST90158) Microcontroller
Manufacturer:
ST Microelectronics
Part Number:
Description:
(ST90x27 / ST90x28) 16K EPROM HCMOS MCUS WITH RAM
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST90R28B6) 16K ROM / 256 RAM HCMOS MCUs
Manufacturer:
ST Microelectronics
Part Number:
Description:
(ST90x31) 8K EPROM HCMOS MCU
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST92195C/D) 48-96 Kbyte ROM HCMOS MCU
Manufacturer:
ST Microelectronics
Part Number:
Description:
16-48K ROM HCMOS MCU WITH ON SCREEN DISPLAY AND VOLTAGE TUNINGOUTPUT
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
48K ROM HCMOS MCUs WITH ON SCREEN DISPLAY AND A/D CONVERTER
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
24K ROM HCMOS MCU WITH ON SCREEN DISPLAY AND CLOSED-CAPTION DATA SLICER
Manufacturer:
ST Microelectronics
Datasheet: