EM65567AF datasheet(53/93 Pages) EMC

53 / 93 page

Preliminary

EM65567

66 COM/ 96 SEG 256 Color STN LCD Driver

* This specification is subject to be changed without notice.

2003/1/9 (V0.1)

8.2 Functions of Control Registers

The EM65567 has many control registers. In case of control register access, upper nibble of data bus (D7~D4) represent

register address, lower nibble of data bus (D3~D0) represent data. The access example is shown in the following. The Pins

(CSB, RS, RDB, WRB) setting are for 80-family MPU interface. Only the setting of terminal (RDB,WRB) is different, when

it is accessed by the 68-fanily MPU.

(Example) X Address

CSB

RDB WRB RE2

RE1

RE0

0000

AX3 AX2 AX1 AX0

0110000

Data

Pins setting

In the writing to the control register, it is used directly as addressing D7~D4 of the data bus. In case of register read, first set

RA register for specific register address, next can read specific register. Therefore, it is need 2-step for register read. Then,

specific register output to D3~D0 of data bus. Except D3~D0 of data bus are all “H”. Prohibit access to undefined register

address area. When RS is “L”, all read/write operations are accessed to display RAM. Then data bus doesn’t include register

address. In case of write, D3~D0 data is written to the register designated at D7~D4 in rising edge of the WRB signal. In case

of read, register can output to data bus is RDB active period. Control register and display RAM are the equal access timing.

8.2.1 Data Write to Display RAM

CSB

RDB WRB RE2

RE1

RE0

Display RAM write data

0010

0/1

The Display RAM data of 8-bit are written in the designated X and Y address.

8.2.2 Data Read from Display RAM

CSB

RDB WRB RE2

RE1

RE0

Display RAM read data

0001

0/1

The 8-bit contents of Display RAM designated in X. and Y address and read out.

Immediately after data are set in X and Y address, dummy read is necessary one time.

8.2.3 Internal Register Data Read

CSB

RDB WRB RE2

RE1

RE0

※※※※

Internal Register read data

0101

0/1

※

Mark shows “Don’t care”

This command is used to read data from an internal register. Before executing the command. You need to set the address and

RE flag for reading data from the internal register.

8.2.4 X Address Register Set

CSB

RDB WRB RE2

RE1

RE0

0000

AX3

AX2

AX1

AX0

0110000

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