aPPenDiX e SuMMaRY OF nOTeS
S1C63003/004/008/016 TeChniCal Manual
Seiko epson Corporation
aP-e-5
(Rev. 1.1)
• When setting the measurement counter or time base counter, always write 5 words of data continuously in
order from the lower address (FF62H
→
FF63H
→
FF64H
→
FF65H
→
FF66H, FF67H
→
FF68H
→
FF69H
→
FF6AH
→
FF6BH). Furthermore, an LD instruction should be used for writing data to the measurement
counter and a read-modify-write instruction (AND, OR, ADD, SUB, etc.) cannot be used. If data other than
low-order 4 bits is written, the counter cannot be set to the desired value.
• The reference and sensor oscillation frequency IC deviation of the R/F converter may increase due to variations
in resistances and capacitances, and board conditions. The 1.5 V low-voltage type is especially sensitive. Take
this into consideration and perform evaluations sufficiently when using the R/F converter.
For the IC deviation, see "Characteristics Curves (RFC reference/sensor oscillation frequency - resistance
characteristic)" in Chapter 19, "Electrical Characteristics."
SVD circuit (S1C63004/008/016)
• To obtain a stable detection result, the SVD circuit must be on for at least 500 µsec. So, to obtain the SVD
detection result, follow the programming sequence below.
1. Set SVDON to "1"
2. Maintain for 500 µsec minimum
3. Set SVDON to "0"
4. Read SVDDT
• The SVD circuit should normally be turned off because SVD operation increase current consumption.
integer multiplier (S1C63008/016)
An operation process takes 10 CPU clock cycles (5 bus cycles) after writing to the calculation mode select register
CALMD until the operation result is set to the destination register DRH/DRL and the operation flags. While this
operation is in process, do not read/write from/to the destination register DRH/DRL and do not read NF/VF/ZF.
Precautions on Mounting
e.2
Oscillation circuit
• Oscillation characteristics change depending on conditions (board pattern, components used, etc.).
In particular, when a ceramic oscillator or crystal oscillator is used, use the oscillator manufacturer's recom-
mended values for constants such as capacitance and resistance.
• Disturbances of the oscillation clock due to noise may cause a malfunction. Consider the following points to
prevent this:
(1) Components which are connected to the OSC1, OSC2, OSC3 and OSC4
terminals, such as oscillators, resistors and capacitors, should be con-
nected in the shortest line.
(2) As shown in the right hand figure, make a V
SS
pattern as large as possible
at circumscription of the OSC1, OSC2, OSC3 and OSC4 terminals and
the components connected to these terminals. Furthermore, do not use
this V
SS
pattern for any purpose other than the oscillation system.
• In order to prevent unstable operation of the oscillation circuit due to current leak between OSC1/OSC3 and
V
DD
, please keep enough distance between OSC1/OSC3 and V
DD
or other signals on the board pattern.
Reset circuit
• The power-on reset signal which is input to the RESET terminal changes depending on conditions (power rise
time, components used, board pattern, etc.). Decide the time constant of the capacitor and resistor after enough
tests have been completed with the application product. When using the built-in pull-down resistor of the RE-
SET terminal, take into consideration dispersion of the resistance for setting the constant.
• In order to prevent any occurrences of unnecessary resetting caused by noise during operating, components
such as capacitors and resistors should be connected to the RESET terminal in the shortest line.
OSC4
OSC3
V
SS
Sample V
SS
pattern (OSC3)