HM538253B/HM538254B Series
EO
Table 1
RAS
Mnemonic
Code
CBRS
CBRR
CBRN
MWT
MSWT
RT
SRT
RWM
BWM
RW (No)
BW (No)
FWM
0
0
0
1
1
1
1
1
1
1
1
1
LMR and
1
Old Mask Set
LCR
Option
1
0
DSF2 (input pin):
DSF2 is also a special function data input flag pin. This pin is fixed to low level in all
operations of the HM538253B/HM538254B.
QSF (output pin):
QSF outputs data of address A8 in SAM. QSF is switched from low to high by accessing
address 255 in SAM, and from high to low by accessing address 511 in SAM.
Operation Cycles of the HM538253B/HM538254B
CAS
Address
CAS
—
—
—
TAP
TAP
TAP
TAP
I/On Input
RAS
—
—
—
WM
WM
—
—
CAS/WE
—
—
—
—
—
—
—
Input data
Column Mask
Input Data
Column Mask
—
Mask Data
Color
—
CAS DT/OE WE
DSF1 DSF2 DSF1 DSF2
RAS
LP
—
—
—
0
1
1
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
1
1
0
1
1
0
1
1
0
0
0
1
1
1
0
0
0
0
0
0
0
—
—
—
—
—
—
—
0
1
0
0
0
0
0
0
0
0
0
Stop
—
—
Row
Row
Row
Row
Row
Row
Row
Row
Row
(Row)
(Row)
Mode
Column WM
Column WM
Column —
Column —
—
—
—
—
WM
—
—
Data
Data Sheet E0163H10
7
ro
0
1
0
0
—
0
0
0
1
0
0
—
du
ct
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