LC87F2W48A Datasheet, PDF (23/26 Pages) Sanyo Semicon Device – 50K-byte FROM and 1536-byte RAM integrated 8-bit 1-chip Microcontroller

LC87F2W48A
• _{CF oscillation low amplifier size selected (CFLAMP=1)}
Oscillation
Nominal
Frequency
Vendor
Name
Oscillator Name
Circuit Constant
Operating
Stabilization Time
Voltage Range
(Symbol: tmsCF)
C1
C2
Rf1
Rd1
[V]
typ
max
Remarks
[pF]
[pF]
[Ω]
[Ω]
[ms]
[ms]
CSTCR4M00G53-R0
(15)
(15) Open 1.0k
2.7 to 5.5
0.07
4MHz
MURATA
CSTLS4M00G53-B0
(15)
(15) Open 1.0k
2.7 to 5.5
0.05
Internal
C1,C2
The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized after an
instruction for starting the main clock oscillation circuit or the time interval that is required for the oscillation to get
stabilized (when oscillation is enabled before HOLD or X’tal HOLD mode is entered) after that mode is released (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 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
[pF]
[pF]
[Ω]
[Ω]
Operating
Voltage
Range
[V]
Oscillation
Stabilization Time
(Symbol: tmsXtal)
typ
max
[s]
[s]
Remarks
32.768kHz
EPSON
TOYOCOM
MC-306
18
18
Open 560k
2.7 to.5.5
Applicable
1.5
3.0
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 or the time interval that is required for the oscillation to get
stabilized (when oscillation is enabled before HOLD mode is entered) after that mode is released (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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