S6B1713
65 COM / 132 SEG DRIVER & CONTROLLER FOR STN LCD
Serial Interface (PS = "L")
When the S6B1713 is active, serial data (DB7) and serial clock (DB6) inputs are enabled. And not active, the internal
8-bit shift register and the 3-bit counter are reset. Serial data can be read on the rising edge of serial clock going into
DB6 and processed as 8-bit parallel data on the eighth serial clock. Serial data input is display data when RS is high
and control data when RS is low. Since the clock signal (DB6) is easy to be affected by the external noise caused by
the line length, the operation check on the actual machine is recommended.
CS1B
CS2
SID
SCLK
RS
DB7 DB6 DB5
DB4 DB3 DB2 DB1
DB0 DB7 DB6
Figure 3. Serial Interface Timing
Busy Flag
The Busy Flag indicates whether the S6B1713 is operating or not. When DB7 is “H” in read status operation, this
device is in busy status and will accept only read status instruction. If the cycle time is correct, the microprocessor
needs not to check this flag before each instruction, which improves the MPU performance.
15