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3 PRECAUTIONS
Take the following precautions when using the S5U1C88816P:
3.1 Precaution for Operation
(1) Turn the power of all equipment off before
connecting or disconnecting cables.
(2) In normal use, other than when evaluating
power voltage changes, you should turn the
VSVD volume completely to the right.
When the SVD reset function has been selected
using the mask option, resetting will occur
when the VSVD volume is completely to the
left, due to the detection of low voltage, causing
the operation of the S5U1C88816P to stop.
Even if the SVD reset function has not been
selected using the mask option, since it will be
set to SVD reset function ON by default setting
until loading the mask option therefore, be sure
to turn the VSVD volume all the way to the
right when starting.
(3) The ICE has a built-in power supply fixed at 5
V. When the LCD drive power is externally
supplied to the S5U1C88816P installed in the
ICE, it must be 5 V or less. If an external LCD
drive power of more than 5 V is used to supply
the V
–V
terminals of the S5U1C88816P,
C1
C5
both units may be destroyed due to the differ-
ence of the interface voltage in the ICE.
If external power is selected by mask option, it
is impossible to adjust contrast by setting the
LCD contrast adjustment registers LC0 to LC3
(register settings become invalid).
(4) The ICE discriminates between maximum
mode and minimum mode according to the
value set in the bus mode setup register
(FF00H•D6, D7). Note, however, that maxi-
mum/minimum mode is selected by mask
option in the S1C88816 and address FF00H is a
general-purpose register that does not indicate
the set mode. Therefore, it is necessary to write
data to bits D6 and D7 in address FF00H in the
initial routine executed after an initial reset to
configure the mode in the ICE.
The S1C88xxx needs writing to FF00H and
FF01H after an initial reset for releasing the
interrupt mask. At this time, the above D6 and
D7 bit data can be written simultaneously.
The values to be set are as follows:
For maximum mode: FF00H•D6 = "1", D7 = "1"
For minimum mode: FF00H•D6 = "0", D7 = "0"
S5U1C88816P MANUAL
(PERIPHERAL CIRCUIT BOARD FOR S1C88816/8F360)
3.2 Differences from Actual IC
Caution is called for due to the following function
and property related difference with the actual IC.
If these precautions are overlooked, it may not
operate on the actual IC, even if it operates on the
ICE with the S5U1C88816P installed.
(1) I/O differences
The logic level (5 V for the S5U1C88816P),
output drive capability and pull up resistance
are different. For this reason, an added circuit
such as a level shifter may be necessary when
interfacing with the target system. Also input
setup time is different therefore, when a circuit
requiring consideration of the input response
time, such as a key matrix, is used, you should
design the system and the software according
to the spec. for the actual IC.
(2) LCD differences
The output drive capability is different.
Since there will be difference with the actual IC
even for the drive voltage, you should design
the system and the software in order to adjust
the characteristics.
(3) Analog comparator differences
The response time and characteristics of the
analog comparator are different. Consequently,
you should design the system and the software
according to the spec. for the actual IC.
(4) Current consumption differences
The current consumption evaluation is impos-
sible.
(5) Function differences
<SVD circuit>
The SVD function is implemented by varying
the apparent power supply voltage with the
VSVD volume.
<Oscillation circuit>
• The S5U1C88816P has a built-in crystal oscilla-
tion circuit for OSC1. The crystal oscillation
frequency is fixed at 32.768 kHz.
• The OSC1 crystal oscillation circuit is the same
regardless of whether the gate capacitor is
connected or not.
EPSON
3 PRECAUTIONS
3
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