S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 174

• Manufacturer Part Number: S1D1
• Description: LCD Controller-driver With Built-in Character ROM
• Manufacturer: Epson Electronics America, Inc.

Busy flag
When the Busy flag is logical 1, the S1D15400 is execut-
ing its internal operations. Any command other than
Status Read is rejected during this time. The Busy flag
is output at pin D7 by the Status Read command. If an
Rev. 1.0
Internal
Internal
timing
timing
WRITE
MPU
MPU
READ
address
Column
DATA
Latch
DATA
Latch
WR
WR
RD
RD
WR
WR
N
Address set
N
at N
N
N
Figure 1 Bus Buffer Delay
N
Dummy read
N
N + 1
EPSON
N + 1
appropriate cycle time (tcyc) is given, this flag needs not
be checked at the beginning of each command and,
therefore, the MPU processing capacity can greatly be
n
N + 1
Data read
n
N + 2
at N
N + 2
n + 1
Address set
N + 2
n + 1
at N + 1
S1D15400 Series
N + 3
n + 2
N + 3
6–9