LC87F1A32A Datasheet, PDF (22/26 Pages) Sanyo Semicon Device – CMOS IC FROM 32K byte, RAM 2048K byte on-chip 8-bit 1-chip Microcontroller with Full-Speed USB

LC87F1A32A
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 Our
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
[pF]
[pF]
[]
Operating
Voltage
Range
[V]
Oscillation
Stabilization Time
typ
max
[ms]
[ms]
Remarks
6MHz
MURATA CSTCR6M00G15L**-R0 (39)
(39)
680
2.7 to 5.5
0.05
0.50
8MHz
MURATA
CSTCE8M00G15L**-R0
(33)
(33)
220
3.0 to 5.5
0.05
10MHz
MURATA
CSTCE10M0G15L**-R0
(33)
(33)
220
3.0 to 5.5
0.05
0.50
Built-in C1, C2
0.50
12MHz
MURATA
CSTCE12M0G15L**-R0
(33)
(33)
330
3.0 to 5.5
0.05
0.50
The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized after VDD
goes above the operating voltage lower limit (see Figure 4).
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 Our
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 CF Oscillator
Nominal
Frequency
Vendor
Name
Oscillator Name
Circuit Constant
C3
C4
Rf
Rd2
Operating
Voltage
Range
Oscillation
Stabilization Time
typ
max
Remarks
[pF]
[pF]
[]
[]
[V]
[s]
[s]
32.768kHz
EPSON
TOYOCOM
MC-306
18
18 OPEN 560k
2.7 to 5.5
1.1
3.0
Applicable
CL value=12.5pF
The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized after the
instruction for starting the subclock oscillation circuit is executed and to the time interval that is required for the
oscillation to get stabilized after the HOLD mode is reset (see Figure 4).
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
0.5VDD
Figure 3 AC Timing Measurement Point
No.A0704-22/26