S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 36

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

(11) Oscillator Circuit (S1D15200
A low power-consumption CR oscillator for adjusting
the oscillation frequency using Rf oscillation resistor
only. This circuit generates a display timing signal.
Some of S1D15200 and S1D15202 series models have a
built-in oscillator and others use an external clock. This
difference must be checked before use.
Connect the Rf oscillation resistor as follows. To sup-
press the built-in oscillator circuit and drive the MPU
using an external clock, enter the clock having the same
phase as the OSC2 of mater chip into OSC2 of the slave
chip.
• MPU having a built-in oscillator
• MPU driven with an external clock
(12) Reset Circuit
Detects a rising or falling edge of an RES input and
initializes the MPU during power-on.
• Initialization status
Rev. 1.1
*1 If the parasitic capacitance of this section increases, the oscillation frequency may shift to the lower
*2 A CMOS buffer is required if the oscillation circuit is connected to two or more slave MPU chips.
1. Display is off.
2. Display start line register is set to line 1.
3. Static drive is turned off.
4. Column address counter is set to address 0.
5. Page address register is set to page 3.
6. 1/32 duty (S1D15200) or 1/16 duty (S1D15202)
7. Forward ADC is selected (ADC command D0 is
8. Read-modify-write is turned off.
is selected.
1 and ADC status flag is 1).
frequency. Therefore, the Rf oscillation frequency must be reduced below the specified level.
V
DD
M/S
OSC1
(CS)
Y driver
CL2
Master chip
Rf
*1
OSC2
(CL)
*
0A Only)
EPSON
*2
The input signal level at RES pin is sensed, and an
MPU interface mode is selected as shown on Table 1.
For the 80-series MPU, the RES input is passed
through the inverter and the active high reset signal
must be entered. For the 68-series MPU, the active
low reset signal must be entered.
As shown for the MPU interface (reference example),
the RES pin must be connected to the Reset pin and
reset at the same time as the MPU initialization.
If the MPU is not initialized by the use of RES pin
during power-on, an unrecoverable MPU failure may
occur.
When the Reset command is issued, initialization
V
SS
M/S
S1D15201F10A
OSC1
(CS)
Open
CL
Slave chip
S1D15200 Series
*
OSC2
(CL)
2–11