HD66765 Datasheet, PDF (7/71 Pages) Hitachi Semiconductor – 396-channel Segment Driver with Internal RAM for 4096-color Displays

HD66765
Table 1 Pin Functional Description (cont)
Signals
Number of
Pins
I/O
Connected to Functions
DB1/SDO 1
I/O MCU
Serves as a 16-bit bidirectional data bus.
For an 8-bit bus interface, data transfer uses DB15-
DB8; fix unused DB7-DB0 to the Vcc or GND level.
For a clock-synchronous serial interface, serves as a
serial data output pin (SDO). Successive bit values
are output on the falling edge of the SCL signal.
DB2-DB15 14
tion _{SEG1–SE 396}
a _G396
y ^Specific _CL1
1
ar M
1
in ^FLM
1
DISPTMG 1
lim ^{DCCLK 1}
Pre ^CCL
1
I/O MPU
O
LCD
O
HD66764
O
HD66764
O
HD66764
O
HD66764
O
HD66764
O
HD66764
Serves as a 16-bit bidirectional data bus.
For an 8-bit bus interface, data transfer uses DB15-
DB8; fix unused DB7-DB0 to the Vcc or GND level.
Output signals for segment drive. In the display-off
period (D1–0 = 00, 01) or standby mode (STB = 1), all
pins output GND level.
The SGS bit can change the shift direction of the
segment signal. For example, if SGS = 0, RAM
address 0000 is output from SEG1. If SGS = 1, it is
output from SEG396.
SEG1, SEG4, SEG7, ... display red (R), SEG2, SEG5,
SEG8, ... display green (G), and SEG3, SEG6,
SEG9, ... display blue (B) (SGS = 0).
The one-raster-row-cycle pulse is output.
The AC-cycle signal is output.
The frame-start pulse is output.
Outputs the display period signal.
Outputs clocks for the step-up.
Clock signal for a serial transfer of register setting
values to the common driver. Data is output on the
falling edge of this clock.
CDA
1
O
HD66764
Data signal for serial transfer as register setting values
to the common driver.
CCS*
1
O
HD66764
Chip-select for the HD66764.
Low: the HD66764 is selected and can receive a serial
transfer.
High: the HD66764 is not selected and cannot receive
a serial transfer.
VSH
1
I
HD66764
Input for the LCD-drive voltage for the segment driver,
which can be provided by the HD66764’s on-chip
power supply. VSH ≤ 4.0 V
V_CC, GND 2
—
Power supply V_CC: + 1.8 V to + 3.6 V; GND (logic): 0
7