LC87F2J32A Datasheet, PDF (26/30 Pages) Sanyo Semicon Device – 8-bit 1-chip Microcontroller

LC87F2J32A
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
Rf2
Rd2
Operating
Voltage
Range
Oscillation
Stabilization Time
typ
max
Remarks
[pF]
[pF]
[Ω]
[Ω]
[V]
[s]
[s]
32.768kHz
EPSON
TOYOCOM
MC-306
18
18
Open 330k
1.8 to.5.5
Applicable
1.4
4.0
CL value=
7.0pF
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
Rf1
CF
CF2
Rd1
C2
Figure 1 CF Oscillator Circuit
XT1
XT2
Rf2
Rd2
C3
C4
X’tal
Figure 2 XT Oscillator Circuit
0.5VDD
Figure 3 AC Timing Measurement Point
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