
S1C88409 TECHNICAL MANUAL
EPSON
215
CHAPTER 8: ELECTRICAL CHARACTERISTICS
8.6 Oscillation Characteristics
Oscillation characteristics change depending on conditions (board pattern, components used, etc.). Use
the following characteristics as reference values. In particular, when a ceramic oscillator or crystal
oscillator is used for OSC3, use the oscillator manufacturer's recommended values for constants such as
capacitance and resistance. The oscillation start time is important because it becomes the waiting time
when OSC3 clock is used. (If OSC3 is used as CPU clock before oscillation stabilizes, the CPU may
malfunction.)
OSC1 crystal oscillation
Item
Oscillation start time
External gate capacitance
Built-in drain capacitance
Frequency/IC deviation
Frequency/supply voltage deviation
Frequency adjustment range
Frequency/operating mode deviation
Note) 1.
Symbol
tsta
CG1
CD1
f/IC
f/V
f/CG
f/MD
Unit
s
pF
ppm
ppm/V
ppm
Note
1
Max.
3
25
10
1
20
Typ.
15
Min.
5
-10
25
When crystal oscillation is selected by mask option.
Condition
Including board capacitance
In case of the chip
VDD=constant
VDD=constant, CG=5 to 25 pF
VDD=constant
Unless otherwise specified:
VDD=1.8 to 5.5 V, VSS=0 V, Ta=25
°C,
Crystal oscillator=Q12C2(made by Seiko Epson corporation), CG1=25 pF(External), CD1=Built-in
OSC1 CR oscillation
Item
Oscillation start time
Frequenct/IC deviation
Symbol
tsta
f/IC
Unit
ms
%
Note
Max.
3
25
Typ.
Min.
-25
Condition
RCR=constant
Unless otherwise specified:
VDD=1.8 to 5.5 V, VSS=0 V, Ta=25
°C, RCR=1.8 M
OSC3 crystal oscillation
Item
Oscillation start time
Note) 1.
Symbol
tsta
Unit
ms
Note
1
Max.
20
Typ.
Min.
The crystal oscillation start time changes by the crystal oscillator to be used, CG2 and CD2.
Condition
Unless otherwise specified:
VDD=2.6/3.5/4.5 to 5.5 V, VSS=0 V, Ta=25
°C, Crystal oscillator=Q21CA301xxx(made by Seiko
Epson corporation), RF=1 M
, CG2=CD2=15 pF
OSC3 ceramic oscillation
Item
Oscillation start time
Symbol
tsta
Unit
ms
Note
Max.
5
Typ.
Min.
Condition
Unless otherwise specified:
VDD=2.6/3.5/4.5 to 5.5 V, VSS=0 V, Ta=25
°C, Ceramic oscillator=CSA4.00MG/CSA8.00MTZ(made
by Murata Mfg. corporation), RF=1 M
, CG2=CD2=30 pF
OSC3 CR oscillation
Item
Oscillation start time
Frequenct/IC deviation
Symbol
tsta
f/IC
Unit
ms
%
Note
Max.
1
25
Typ.
Min.
-25
Condition
RCR=constant
Unless otherwise specified:
VDD=2.6/3.5/4.5 to 5.5 V, VSS=0 V, Ta=25
°C