
S1C88409 TECHNICAL MANUAL
EPSON
11
CHAPTER 1: OUTLINE
1.5 Mask Option
Mask options shown below are provided for the
S1C88409. Several hardware specifications are
prepared in each mask option, and one of them
can be selected according to the application. The
function option generator FOG88409, that has been
prepared as the development software tool of the
S1C88409, is used for this selection. Mask pattern
of the IC is finally generated based on the data
created by the FOG88409. Refer to the
"S5U1C88409D Manual" for details on the
FOG88409.
<Functions selectable with S1C88409 mask options>
(1) Bus mode
The bus mode that is set at initial reset can be
selected. It is necessary to select it when using
the S1C88409 in the MPU mode. Refer to
Section 5.2, "System Controller and Bus
Control", for details.
(2) OSC1 oscillation circuit
The specification of the OSC1 oscillation circuit
can be selected from among four types: "Crys-
tal oscillation", "CR oscillation", "Crystal
oscillation (gate capacitor built-in)" and
"External clock input". Refer to Section 5.4.3,
"OSC1 oscillation circuit", for details.
(3) OSC3 oscillation circuit
The specification of the OSC3 oscillation circuit
can be selected from among four types: "Crys-
tal oscillation", "Ceramic oscillation", "CR
oscillation" and "External clock input". Refer to
Section 5.4.4, "OSC3 oscillation circuit", for
details.
(4) MCU/MPU terminal pull-up resistor
This mask option can select whether the pull-
up resistor for the MCU/MPU terminal is used
or not.
(5) RESET terminal pull-up resistor
This mask option can select whether the pull-
up resistor for the RESET terminal is used or
not.
(6) Input port pull-up resistor
This mask option can select whether the pull-
up resistor for the input port terminal is used
or not. It is possible to select for each bit of the
input ports. Refer to Section 5.6.2, "Mask
option", for details.
(7) I/O port pull-up resistor
This mask option can select whether the pull-
up resistor for the I/O port terminal (it works
during input mode) is used or not. It is possible
to select for each bit of the input ports. Refer to
Section 5.8.3, "Mask option", for details.
(8) Data RAM, Display RAM capacity
The S1C88409 has built-in 3.75KB RAM. The
data memory/display memory size can be
selected from seven types (256/3584, 512/3328,
768/3072, 1024/2816, 1280/2560, 1536/2304,
1792/2048 bytes) according to the LCD panel to
be used. Refer to Section 3.2.2, "RAM (Data
Memory, Display Memory)", for details.
(9) Touch panel control terminal
The control signal output terminals of the
touch panel controller are shared with the I/O
port terminals P20 to P23. The P20–P23 termi-
nals can be set for either the touch panel
controller or the I/O port. Refer to Section
5.17.2, "Terminal configuration", for details.
(10) Touch panel controller input terminal
Two terminals can be selected from the I/O
port terminals P30–P35 for inputting the X and
Y coordinate detection signals of the touch
panel to the A/D converter. Refer to Section
5.17.2, "Terminal configuration", for details.