Epson SED 1520 Series manual 27

SED1520 Series

Read-Modify-Write
				R/W
	A0		RD	WR	D7	D6	D5	D4	D3	D2	D1	D0
	0	1		0	1	1	1	0	0	0	0	0	E0H

This command defeats column address register auto-increment after data reads. The current conetents of the column address register are saved. This mode remains active until an End command is received.

• Operation sequence during cursor display

When the End command is entered, the column address is returned to the one used during input of Read-Modify-Write command. This function can reduce the load of MPU when data change is repeated at a specific display area (such as cursor blinking).

*Any command other than Data Read or Write can be used in the Read-Modify-Write mode. However, the Column Address Set command cannot be used.

Set Page Address

Set Column Address

Read-Modify-Write

Dummy Read

Read Data

Write Data

No

Completed?

Yes

End

End

			R/W
A0		RD	WR	D7	D6	D5	D4	D3	D2	D1	D0
0	1		0	1	1	1	0	1	1	1	0	EEH

This command cancels read-modify-write mode and restores the contents of the column address register to their value prior to the receipt of the Read-Modify-Write command.

Return

Column address	N	N+1 N+2 N+3	N+m	N
	Read-Modify-Write mode is selected.			End

2–18 EPSON