LC875832A Datasheet, PDF (20/23 Pages) Sanyo Semicon Device – 8-bit 1-chip Microcontroller

LC875832A/24A/16A
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
Nominal
Frequency
Vendor Name
Oscillator Name
Circuit Constant
C1
C2
Rd1
[pF] [pF]
[Ω]
Operating
Voltage
Range
[V]
Oscillation Stabilization
Time
typ
max
[ms]
[ms]
Remarks
MURATA
CSTCE10M0G52-R0 (10) (10)
470
3.0 to 3.6
0.05
10MHz
KYOCERA
PBRC10.00HR
(10) (10)
0
3.0 to 3.6
0.06
0.25
Internal C1, C2
0.3
Internal C1, C2
8MHz
MURATA
CSTCE8M00G52-R0 (10) (10)
1k
2.5 to 3.6
0.05
KYOCERA
PBRC8.00HR
(30) (30)
0
2.5 to 3.6
0.07
0.25
Internal C1, C2
0.35
Internal C1, C2
4MHz
MURATA
CSTCR4M00G53-R0 (15) (15)
2.2k
2.2 to 3.6
0.05
KYOCERA
PBRC4.00HR
(30) (30)
0
2.2 to 3.6
0.08
0.25
Internal C1, C2
0.4
Internal C1, C2
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 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
[pF] [pF] [Ω] [Ω]
Operating Voltage
Range
[V]
Oscillation Stabilization
Time
typ
max
[s]
[s]
Remarks
Applicable
32.768kHz SEIKO EPSON
MC-306
15
15 10M 510k
2.2 to 3.6
1.0
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 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
CF2
Rd1
C1
CF
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.8300-20/23