
170
EPSON
S1C8F360 TECHNICAL MANUAL
10 ELECTRICAL CHARACTERISTICS
10.7 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 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 wait time when OSC3 clock is used. (If OSC3 is
used as CPU clock before oscillation stabilizes, the CPU may malfunction.)
s OSC1 (Crystal)
Item
Symbol
Min.
Typ.
Max.
Unit
Condition
Oscillation start time
External gate capacitance
Built-in gate capacitance
Built-in drain capacitance
Frequency/IC deviation
Frequency/power voltage deviation
Frequency adjustment range
Frequency/operating mode devistion
tsta
CG1
CD1
f/IC
f/V
f/CG
f/MD
5
–
-10
15
–
15
3
25
–
10
2
20
S
pF
ppm
ppm/V
ppm
Including board capacitance
In case of the chip
VDD = constant
VDD = constant, CG = 5 to 25pF
VDD = constant
Note
1
2
Unless otherwise specified: VDD = Within the operating voltage in each operating mode, VSS = 0 V, Ta = 25
°C,
Crystal oscillator = Q12C2*, CG1 = 25 pF, CD1 = Built-in
*
Q12C2 Made by Seiko Epson corporation
Note) 1
2
The S1C8F360 supports a crystal oscillation circuit only.
The S1C8F360 has no built-in gate capacitance.
s OSC3 (Crystal)
Min.
Typ.
Max.
Oscillation start time (Normal mode)
Oscillation start time (High speed mode)
tsta
20
mS
4.0 MHz crystal oscillator
8.0 MHz crystal oscillator
1
Item
Symbol
Unit
Condition
Note
Unless otherwise specified: VDD = Within the operating voltage in each operating mode, VSS = 0 V, Ta = 25
°C,
Crystal oscillator = Q21CA301xxx*, RF = 1M
, CG2 = CD2 = 15pF
Note) 1
The crystal oscillation start time changes by the crystal oscillator to be used, CG2 and CD2.
*
Q21CA301xxx Made by Seiko Epson corporation
s OSC3 (Ceramic)
Min.
Typ.
Max.
tsta
5
mS
1
Oscillation start time (Normal mode)
Oscillation start time (High speed mode)
4.0 MHz ceramic oscillator
8.0 MHz ceramic oscillator
Item
Symbol
Unit
Condition
Note
Unless otherwise specified: VDD = Within the operating voltage in each operating mode, VSS = 0 V, Ta = 25
°C,
Ceramic oscillator = CSA4.00MG / CSA8.00MTZ*, RF = 1M
, CG2 = CD2 = 30pF
*
1
Note)
CSA4.00MG / CSA8.00MTZ Made by Murata Mfg. corporation
The ceramic oscillation start time changes by the ceramic oscillator to be used, CG2 and CD2.
s OSC3 (CR)
Min.
Typ.
Max.
tsta
f/IC
-25
1
25
mS
%
RCR = constant
Oscillation start time (Normal mode)
Oscillation start time (High speed mode)
Frequency/IC deviation (Normal mode)
Frequency/IC deviation (High speed mode)
Item
Symbol
Unit
Condition
Note
Unless otherwise specified: VDD = Within the operating voltage in each operating mode, VSS = 0 V, Ta = 25
°C