
S1C88848 TECHNICAL MANUAL
EPSON
5
1 INTRODUCTION
1.4 Mask Option
Mask options shown below are provided for the
S1C88848. Several hardware specifications are
prepared in each mask option, and one of them can
be selected according to the application. The
function option generator winfog, that has been
prepared as the development software tool of the
S1C88848, is used for this selection. Mask pattern
of the IC is finally generated based on the data
created by the winfog. Refer to the "S5U1C88000C
Manual II" for details on the winfog.
S1C88848 optional specifications
(1)
___________
RESET terminal pull-up resistor
This mask option can select whether the pull-up
___________
resistor for the RESET terminal is used or not.
(2) External reset by simultaneous LOW
input to the input port (K00–K03)
This function resets the IC when several keys
are pressed simultaneously. The mask option is
used to select whether this function is used or
not. Further when the function is used, a
combination of the input ports (K00–K03),
which are connected to the keys to be pressed
simultaneously, can be selected. Refer to Section
4.1.2, "Simultaneous LOW level input at input
port terminals K00–K03", for details.
(3) OSC1 oscillation circuit
The specification of the OSC1 oscillation circuit
can be selected from "Crystal oscillation" and
"CR oscillation". Refer to Section 5.3.3, "OSC1
oscillation circuit", for details.
(4) OSC3 oscillation circuit
The specification of the OSC3 oscillation circuit
can be selected from among three types:
"Crystal oscillation", "Ceramic oscillation" and
"CR oscillation". Refer to Section 5.3.4, "OSC3
oscillation circuit", for details.
(5) 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 5.4, "Input Ports (K
ports)", for details.
(6) R26, R51 output port specifications
The R26 port can be configured as a general-
_________
purpose output port, TOUT output port (TOUT
inverted output) or REM (remoto-control
carrier) output port.
The R51 port can be configured as a general-
_____
purpose output port or BZ output port (BZ
inverted output). Refer to Section 5.5, "Output
Ports (R ports)", 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 I/O ports. Refer to
Section 5.6, "I/O Ports (P ports)", for details.
Since P10 to P13 are shared with the serial
interface I/O terminals, the selected P10 and
P12 terminal configuration is applied to the
serial input (SIN) terminal and serial clock input
_________
terminal (SCLK in clock synchronous mode)
when the serial interface is used. Refer to
Section 5.7, "Serial Interface", for details.
(8) LCD drive duty
The drive duty for the built-in LCD driver can
be selected from software switchable (between
1/32 and 1/16), fixed at 1/17 and fixed at 1/8.
Refer to Section 5.11, "LCD Controller", for
details.
(9) LCD power supply
Either the internal power supply or an external
power supply can be selected as the LCD
system power source. Furthermore, when using
the internal power supply, the LCD drive
voltage can be set for a 4.5 V panel or a 5.5 V
panel and the drive bias to 1/5 or 1/4. Refer to
Section 5.11, "LCD Controller", for details.
(10) SEG40–SEG50 port specifications
The SEG40 to SEG50 ports can be configured as
LCD segment output ports or general-purpose
output ports. Refer to Section 5.11, "LCD
Controller", for details of the LCD segment
output, and Section 5.5, "Output Ports (R
ports)", for details of the DC output.