hd66712u Renesas Electronics Corporation., hd66712u Datasheet - Page 12

• Manufacturer Part Number: hd66712u
• Description: Dot-matrix Liquid Crystal Display Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

Pin Functions
Table 1
Signal
IM
RW/SID
E/SCLK
DB4 to
DB7
DB1 to
DB3
DB0/ SOD 1
COM0 to
COM33
SEG1 to
SEG60
RS/CS*
Number
of Pins
1
1
1
1
4
3
34
60
Pin Functional Description
I/O
I
I
I
I
I/O
I/O
I/O
/O
O
O
Device
Interfaced with
—
MPU
MPU
MPU
MPU
MPU
MPU
LCD
LCD
Function
Selects interface mode with the MPU;
Low: Serial mode
High: 4-bit/8-bit bus mode
(Bus width is specified by instruction.)
Low: Instruction register (write);
Busy flag, address counter (read)
High: Data register (write/read)
Acts as chip-select during serial mode:
Low: Select (access enable)
High: Not selected (access disable)
Low: Write
High: Read
Inputs serial data during serial mode.
Inputs (Receives) serial clock during serial mode.
Used for data transfer between the MPU and the
HD66712. DB7 can be used as a busy flag. Open
these pins during serial mode since those signals.
Used for data transfer between the MPU and the
HD66712. Open these pins during 4-bit operation or
serial mode since they are not used.
mode. Open these pins during 4-bit mode since they
are not used.
Outputs (transfers) serial data during serial mode.
Open this pin if reading (transfer) is not performed.
Common signals; those that are not used become non-
selected waveforms. At 1/17 duty rate, COM1 to
COM16 are used for character display, COM0 and
COM17 for icon display, and COM18 to COM33
become non-selected waveforms. At 1/33 duty rate,
COM1 to COM32 are used for character display, and
COM0 and COM33 for icon display. Because two COM
signals output the same level simultaneously, apply
them according to the wiring pattern of the display
device.
Segment output signals
Selects registers during bus mode:
Selects read/write during bus mode;
Starts data read/write during bus mode;
Four high-order bidirectional tristate data bus pins.
Three low order bidirectional tristate data bus pins.
The lowest bidirectional data bit (DB0) during 8-bit bus
HD66712U
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