Epson S1D13708 Benutzerhandbuch
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.
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.
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 (M
Ω
) 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.
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.)