PATENTED
Read-Modify-Write Mode (Successive Address Accessing)
C S
HT1621/HT1621G
W R
R D
1
0
1
A 5 A 4 A 3 A 2 A 1 A 0 D 0 D 1 D 2 D 3 D 0 D 1 D 2 D 3 D 0 D 1 D 2 D 3 D 0 D 1 D 2 D 3 D 0 D 1 D 2 D 3 D 0
M e m o ry A d d re s s (M A ) D a ta (M A )
D a ta (M A )
D a ta (M A + 1 ) D a ta (M A + 1 ) D a ta (M A + 2 )
D A T A
Command Mode (Command Code : 1 0 0)
C S
W R
1
0
0
C 8 C 7 C 6 C 5 C 4 C 3 C 2 C 1 C 0
C 8 C 7 C 6 C 5 C 4 C 3 C 2 C 1 C 0
C o m m a n d 1
C o m m a n d ...
C o m m a n d i
D A T A
C o m m a n d
o r
D a ta M o d e
Mode (Data and Command Mode)
C S
W R
D A T A
C o m m a n d
o r
D a ta M o d e
A d d re s s & D a ta
C o m m a n d
o r
D a ta M o d e
A d d re s s a n d D a ta
C o m m a n d
o r
D a ta M o d e
A d d re s s a n d D a ta
R D
Note:
It is recommended that the host controller should read in the data from the DATA line between the rising edge
of the RD line and the falling edge of the next RD line.
Rev. 3.10
12
November 5, 2012
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
