LC88F58B0A Datasheet, PDF (22/25 Pages) Sanyo Semicon Device – FROM 128K byte, RAM 4096K byte on-chip 16-bit 1-chip Microcontroller

LC88F83B0A
Characteristics of a Sample OSC1 System Clock Oscillation Circuit
Given below are the characteristics of a sample OSC1 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 OSC1 System Clock Oscillator Circuit with a Ceramic Oscillator
Nominal
Frequency
Vendor
Name
Oscillator
Name
Circuit Constant
Operating
Voltage
Oscillation
Stabilization Time
C1
C2
Rf1
Rd1
Range
typ
max
[pF]
[pF]
[Ω]
[Ω]
[V]
[ms]
[ms]
Remarks
CSTCR4M00G53-R0 (15)
(15) OPEN
0
4.194MHz MURATA
CSTLS4M00G53-B0 (15)
(15) OPEN
0
2.4 to 5.5
0.1
2.4 to 5.5
0.1
0.5
Internal C1,C2
0.5
CSTCR4M00G53-R0 (15)
(15) OPEN
0
4.000MHz MURATA
CSTLS4M00G53-B0 (15)
(15) OPEN
0
2.4 to 5.5
0.1
2.4 to 5.5
0.1
0.5
Internal C1,C2
0.5
The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized after the
following reference timing points: (See Figure 4)
• VDD goes above the operating voltage lower limit.
• An instruction for starting the OSC1 clock oscillator circuit is executed.
• Oscillation starts after the microcontroller exits the X'tal HOLD mode with the ENOSC1 bit (OCR0 register, bit 1)
set to 1.
Characteristics of a Sample OSC0 System Clock Oscillator Circuit
Given below are the characteristics of a sample OSC0 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 2 Characteristics of a Sample OSC0 System Clock Oscillator Circuit with a CF Oscillator
Nominal
Frequency
Vendor Name
Oscillator Name
Circuit Constant
Operating
Voltage
Oscillation
Stabilization Time
C3
C4
Rf2
Rd2
Range
typ
max
Remarks
[pF]
[pF]
[Ω]
[Ω]
[V]
[s]
[s]
32.768kHz
EPSON
TOYOCOM
MC-306
Applicable
18
18
OPEN 390k 2.3 to 5.5
1.3
3.0
CL value=12.5pF
SMD-type
The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized after the
instruction for starting the OSC0 clock oscillation circuit is executed. (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.
Rf1
CF1
CF2
Rd1
C1
C2
CF
Figure 1 CF Oscillator Circuit
Rf2
XT1
XT2
Rd2
C3
C4
X’tal
Figure 2 XT Oscillator Circuit
0.5VDD
Figure 3 AC Timing Measurement Point
No.A1228-22/25