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Epson Research and Development Page 211
Vancouver Design Center
Hardware Functional Specification S1D13708
Issue Date: 02/03/07 X39A-A-001-02
16 Embedded Crystal Oscillator
The S1D13708 includes an embedded crystal oscillator which is available when the
Indirect Interface is selected.
16.1 Oscillator Circuit
When a crystal is used in conjunction with the S1D13708, the designer must connect an
external resistor and capacitors as recommended in the following figure.
Figure 16-1 Recommended Crystal Oscillator Circuit
Where R
fb
is a feedback resistor, and C
1
and C
2
are load capacitances. To determine the
appropriate values for the system, a good starting point is 1 megOhm (MΩ) for R
fb
, 10
picoFarads (pF) for C
1
, and 10 picoFarads (pF) for C
2
. The values of R
fb
, C
1
, and C
2
should
be further refined to meet the frequency requirements of the system.
Note
The XTAL Enable bits (REG[CAh] bits 5 and 4) are used to enable the oscillator circuit.
See the BCLK Source Select Register on page 157 for further information on these two
bits.
C
1
C
2
R
fb
Crystal
XTAL1
XTAL0
(12MHz Max.)