LC87F7CC8A Datasheet, PDF (18/21 Pages) Sanyo Semicon Device – FROM 128K byte, RAM 4096 byte on-chip 8-bit 1-chip Microcontroller

LC87F7CC8A
Characteristics of a Sample Main System Clock Oscillation Circuit
The characteristics in the table bellow is based on the following conditions:
(1) Use the standard evaluation board SANYO has provided.
(2) Use the peripheral parts with indicated value externally.
(3) The peripheral parts value is a recommended value of oscillator manufacturer
Table 1 Characteristics of a Sample Main System Clock Oscillator Circuit with a Ceramic Oscillator
Nominal
Frequency
Vendor
Name
Oscillator Name
12MHz
MURATA CSTCE12M0G52-R0
Circuit Constant
C1
C2
Rf1
Rd1
[pF]
[pF]
[Ω]
[Ω]
(10)
(10) Open 470
Operating
Voltage
Range
[V]
4.5 to 5.5
Oscillation
Stabilization Time
typ
max
[ms]
[ms]
0.05
0.15
Remarks
Internal
C1, C2
CSTCE10M0G52-R0
(10)
(10) Open 1.0k
2.8 to 5.5
0.05
10MHz
MURATA
CSTLS10M0G53-B0
(15) (15) Open 680
2.8 to 5.5
0.05
0.15
0.15
Internal
C1, C2
CSTCR4M00G53-R0
(15)
(15) Open 3.3k
2.2 to 5.5
0.05
4MHz
MURATA
CSTLS4M00G53-B0
(15)
(15) Open 3.3k
2.2 to 5.5
0.05
0.15
0.15
Internal
C1, C2
The oscillation stabilizing time is a period until the oscillation becomes stable after VDD becomes higher than
minimum operating voltage (See Fig. 4).
Characteristics of a Sample Subsystem Clock Oscillator Circuit
The characteristics in the table bellow is based on the following conditions:
(1) Use the standard evaluation board SANYO has provided.
(2) Use the peripheral parts with indicated value externally.
(3) The peripheral parts value is a recommended value of oscillator manufacturer
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]
Applicable
32.768kHz SEIKO EPSON
MC-306
18
18 Open 560k
2.2 to 5.5
1.3
3.0
CL value
=12.5pF
The oscillation stabilizing time is a period until the oscillation becomes stable after executing the instruction which
starts the sub-clock oscillation or after releasing the HOLD mode (See Fig. 4).
Note : Since the circuit pattern affects the oscillation frequency, place the oscillation-related parts as close to
the oscillation pins as possible with the shortest possible pattern length.
CF1
CF2
XT1
XT2
Rf1
Rd1
C1
C2
CF
Figure 1 Ceramic Oscillator Circuit
Rf2
Rd2
C3
C4
X’tal
Figure 2 Crystal Oscillator Circuit
0.5VDD
Figure 3 AC Timing Measurement Point
No.A0147-18/21