HT0313A Tomato LSI, Inc., HT0313A Datasheet - Page 16

• Manufacturer Part Number: HT0313A
• Description: 65COM/132SEG DRIVER & CONTROLLER FOR STN LCD
• Manufacturer: Tomato LSI, Inc.

HT0313A
TOMATO LSI Inc.
6. FUNCTIONAL DESCRIPTION
6-1. MICROPROCESSOR INTERFACE
a. Chip select input
b. Interface
Table 6-1. Parallel / Serial interface mode
c. Parallel interface (PS = "H")
Table 6-2. Microprocessor selection for parallel interface
Table 6-3. Parallel data transfer
There are /CS1 and CS2 pins for chip selection. The HT0313A can interface with an MPU only when
/CS1 is “L” and CS2 is “H”. When these pins are set to any other combination, RS, E_/RD, and RW_/WR
inputs are disabled and DB7 to DB0 are to be high impedance. And, in case of serial interface, the
internal shift register and the counter are reset.
HT0313A has three types of interface with an MPU, which are one serial and two parallel interfaces. This
parallel or serial interface is determined by PS pin as shown in table 6-1.
The 8-bit bi-directional data bus is used in parallel interface and the type of MPU is selected by C68 as
shown in table 6-2. The type of data transfer is determined by signals at RS, E_/RD, and RW_/WR as
shown in table 6-3.
Common
C68
RS
PS
H
H
H
L
L
H
L
L
E_/RD
65COM / 132SEG DRIVER & CONTROLLER FOR STN LCD
Parallel
/CS1
/CS1
/CS1
Serial
(
Type
E
H
H
H
H
6800-series
)
16
RW_/WR
(RW)
H
H
L
L
CS2
CS2
CS2
/CS1
/CS1
/CS1
E_/RD
(/
RD
H
H
L
L
8080-series
RS
RS
RS
)
CS2
CS2
CS2
RW_/WR
(/
WR
H
H
L
L
E_/RD
)
/RD
E
C68
X*
H
L
Writes to internal register(instruction)
RW_/WR
/WR
RW
Display data read out
X : Don't care
Register status read
Display data write
Description
6800-series MPU mode
8080-series MPU mode
DB7 to DB0
DB7 to DB0
DB7 to DB0
Serial MPU mode
Interface mode
Ver 0.0
6800-series
8080-series
MPU