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ST7066 Schematic ( PDF Datasheet ) - Sitronix

Teilenummer ST7066
Beschreibung Dot Matrix LCD Controller/Driver
Hersteller Sitronix
Logo Sitronix Logo 




Gesamt 29 Seiten
ST7066 Datasheet, Funktion
ST
Sitronix
ST7066
Dot Matrix LCD Controller/Driver
Features
!" 5 x 8 and 5 x 11 dot matrix possible
!" Low power operation support:
-- 2.7 to 5.5V
!" Wide range of LCD driver power
-- 3.0 to 11V
!" Correspond to high speed MPU bus interface
-- 2 MHz (when VCC = 5V)
!" 4-bit or 8-bit MPU interface enabled
!" 80 x 8-bit display RAM (80 characters max.)
!" 9,920-bit character generator ROM for a total of
240 character fonts
-- 208 character fonts (5 x 8 dot)
-- 32 character fonts (5 x 11 dot)
!" 64 x 8-bit character generator RAM
-- 8 character fonts (5 x 8 dot)
-- 4 character fonts (5 x 11 dot)
!" 16-common x 40-segment liquid crystal display
driver
!" Programmable duty cycles
-- 1/8 for one line of 5 x 8 dots with cursor
-- 1/11 for one line of 5 x 11 dots & cursor
-- 1/16 for two lines of 5 x 8 dots & cursor
!" Wide range of instruction functions:
Display clear, cursor home, display on/off,
cursor on/off, display character blink, cursor
shift, display shift
!" Pin function compatibility with HD44780,
KS0066 and SED1278
!" Automatic reset circuit that initializes the
controller/driver after power on
!" Internal oscillator with external resistors
!" Low power consumption
!" QFP80 and Bare Chip available
Description
The ST7066 dot-matrix liquid crystal display
controller and driver LSI displays alphanumeric,
Japanese kana characters, and symbols. It can be
configured to drive a dot-matrix liquid crystal display
under the control of a 4- or 8-bit microprocessor.
Since all the functions such as display RAM,
character generator, and liquid crystal driver, required
for driving a dot-matrix liquid crystal display are
internally provided on one chip, a minimal system can
be interfaced with this controller/driver.
The ST7066 has pin function compatibility with the
HD44780, KS0066U and SED1278 that allows the
user to easily replace it with an ST7066. The ST7066
character generator ROM is extended to generate
208 5 x 8 dot character fonts and 32 5 x 11 dot
character fonts for a total of 240 different character
fonts. The low power supply (2.7V to 5.5V) of the
ST7066 is suitable for any portable battery-driven
product requiring low power dissipation.
The ST7066 LCD driver consists of 16 common
signal drivers and 40 segment signal drivers which
can extend display size by cascading segment driver
ST7065 or ST7063. The maximum display size can
be either 80 characters in 1-line display or 40
characters in 2-line display. A single ST7066 can
display up to one 8-character line or two 8-character
lines.
Product Name
ST7066-0A
ST7066-0B
Support Character
English / Japan
English / European
V1.2
1 2000/6/13






ST7066 Datasheet, Funktion
ST7066
FUNCTION DESCRIPTION
System Interface
This chip has all two kinds of interface type with MPU : 4-bit bus and 8-bit bus. 4-bit bus or 8-bit bus is selected by DL
bit in the instruction register.
During read or write operation, two 8-bit registers are used. One is data register (DR), the other is instruction
register(IR).
The data register(DR) is used as temporary data storage place for being written into or read from DDRAM/CGRAM,
target RAM is selected by RAM address setting instruction. Each internal operation, reading from or writing into
RAM, is done automatically. So to speak, after MPU reads DR data, the data in the next DDRAM/CGRAM address is
transferred into DR automatically. Also after MPU writes data to DR, the data in DR is transferred into
DDRAM/CGRAM automatically.
The Instruction register(IR) is used only to store instruction code transferred from MPU. MPU cannot use it to read
instruction data.
To select register, use RS input pin in 4-bit/8-bit bus mode.
Table 1. Various kinds of operations according to RS and R/W bits.
RS RW
Operation
L L Instruction Write operation (MPU writes Instruction code
into IR)
L H Read Busy Flag(DB7) and address counter (DB0 ~ DB6)
H L Data Write operation (MPU writes data into DR)
H H Data Read operation (MPU reads data from DR)
Busy Flag (BF)
When BF = "High”, it indicates that the internal operation is being processed. So during this time the next instruction
cannot be accepted. BF can be read, when RS = Low and R/W = High (Read Instruction Operation), through DB7
port. Before executing the next instruction, be sure that BF is not High.
Address Counter (AC)
Address Counter(AC) stores DDRAM/CGRAM address, transferred from IR.
After writing into (reading from) DDRAM/CGRAM, AC is automatically increased (decreased) by 1.
When RS = "Low" and R/W = "High", AC can be read through DB0 ~ DB6 ports.
V1.2
6 2000/6/13

6 Page









ST7066 pdf, datenblatt
ST7066
Character Code
(DDRAM Data)
CGRAM
Address
Character Patterns
(CGRAM Data)
b7 b6 b5 b4 b3 b3 b1 b0 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0
000
000
11111
000
001
00100
000
010
00100
0000 - 000000011 - - - 00100
000
100
00100
000
101
00100
000
110
00100
000
111
00000
001
000
11110
001
001
10001
001
010
10001
0000 - 001000011 - - - 11110
001
100
10100
001
101
10010
001
110
10001
001
111
00000
Table 5 Relationship between CGRAM Addresses, Character Codes (DDRAM) and Character patterns (CGRAM Data)
Notes:
1. Character code bits 0 to 2 correspond to CGRAM address bits 3 to 5 (3 bits: 8 types).
2. CGRAM address bits 0 to 2 designate the character pattern line position. The 8th line is the
cursor position and its display is formed by a logical OR with the cursor. Maintain the 8th line data, corresponding
to the cursor display position, at 0 as the cursor display. If the 8th line data is 1, 1 bits will light up the 8th line
regardless of the cursor presence.
3. Character pattern row positions correspond to CGRAM data bits 0 to 4 (bit 4 being at the left).
4. As shown Table 5, CGRAM character patterns are selected when character code bits 4 to 7 are
all 0. However, since character code bit 3 has no effect, the R display example above can be selected by either
character code 00H or 08H.
5. 1 for CGRAM data corresponds to display selection and 0 to non-selection.
“-“: Indicates no effect.
V1.2
12 2000/6/13

12 Page





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