LC87F1D64A Datasheet, PDF (25/29 Pages) Sanyo Semicon Device – CMOS IC FROM 64K byte, RAM 4K byte on-chip 8-bit 1-chip Microcontroller with Full-Speed USB

LC87F1D64A
Characteristics of a Sample Main System Clock Oscillation Circuit
Given below are the characteristics of a sample main system clock oscillation circuit that are measured using a
SANYO-designated oscillation characteristics evaluation board and external components with circuit constant values
with which the oscillator vendor confirmed normal and stable oscillation.
Table 1 Characteristics of a Sample Main System Clock Oscillator Circuit with a Ceramic Oscillator at Ta = 0°C to +70°C
Nominal
Frequency
Vendor
Name
Oscillator Name
Circuit Constant
C1
C2
Rd1
Operating
Voltage
Range
Oscillation
Stabilization Time
typ
max
Remarks
[pF]
[pF]
[Ω]
[V]
[ms]
[ms]
8MHz
MURATA CSTCE8M00G15L**-R0 (33)
(33)
680
2.7 to 5.5
0.1
0.5
C1 and C2
12MHz
MURATA CSTCE12M0G15L**-R0 (33)
(33)
470
3.0 to 5.5
0.1
0.5
integrated
16MHz
MURATA CSTCE16M0V13L**-R0 (15)
(15)
330
3.0 to 5.5
0.05
0.25
SMD type
The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized in the
following cases (see Figure 4):
• Till the oscillation gets stabilized after VDD goes above the operating voltage lower limit.
• Till the oscillation gets stabilized after the instruction for starting the main clock oscillation circuit is executed
• Till the oscillation gets stabilized after the HOLD mode is reset.
• Till the oscillation gets stabilized after the X'tal HOLD mode is reset with CFSTOP (OCR register, bit 0) set to 0
Characteristics of a Sample Subsystem Clock Oscillator Circuit
Given below are the characteristics of a sample subsystem clock oscillation circuit that are measured using a SANYO-
designated oscillation characteristics evaluation board and external components with circuit constant values with which
the oscillator vendor confirmed normal and stable oscillation.
Table 2 Characteristics of a Sample Subsystem Clock Oscillator Circuit with a Crystal Oscillator
Nominal
Frequency
Vendor
Name
Oscillator Name
Circuit Constant
C3
C4
Rf
Rd2
Operating
Voltage
Range
Oscillation
Stabilization Time
typ
max
Remarks
[pF] [pF]
[Ω]
[Ω]
[V]
[s]
[s]
32.768kHz
EPSON
TOYOCOM
MC-306
Applicable
18
18 OPEN 560k 2.7 to 5.0
1.1
3.0
CL value=12.5pF
SMD type
The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized in the
following cases (see Figure 4):
• Till the oscillation gets stabilized after the instruction for starting the subclock oscillation circuit is executed
• Till the oscillation gets stabilized after the HOLD mode is reset with EXTOSC (OCR register, bit 6) set to 1
Note: The components that are involved in oscillation should be placed as close to the IC and to one another as possible
because they are vulnerable to the influences of the circuit pattern.
CF1
C1
CF
CF2
Rd1
C2
Figure 1 CF Oscillator Circuit
XT1
XT2
Rf
Rd2
C3
C4
X’tal
Figure 2 XT Oscillator Circuit
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