LC877816A_08 Datasheet, PDF (18/21 Pages) Sanyo Semicon Device – 8-bit 1-chip Microcontroller

LC877816A/12A/08A
Main System Clock Oscillation Circuit Characteristics
The characteristics in the table bellow is based on the following conditions:
Use the standard evaluation board SANYO has provided.
Use the peripheral parts with indicated value externally.
The peripheral parts value is a recommended value of oscillator manufacturer
Table 1. Main system clock oscillation circuit characteristics using ceramic resonator
Frequency
Manufacturer Type
Oscillator
Circuit parameters
C1
C2
Rd
[pF] [pF]
[Ω]
Operating
supply voltage
range[V]
Oscillation
stabilizing time
typ
max
[ms]
[ms]
4.00MHz
Murata
SMD CSTCR4M00G53-R0 (15) (15)
1k
Lead
CSTLS4M00G53-B0
(15)
(15)
2.2k
2.4 to 3.6
2.4 to 3.6
0.2
0.6
0.2
0.6
The oscillation stabilizing time is a period until the oscillation becomes stable after VDD becomes higher than
minimum operating voltage. (See Fig. 4)
Notes
Internal
C1, C2
Subsystem Clock Oscillation Circuit Characteristics
The characteristics in the table bellow is based on the following conditions:
Use the standard evaluation board SANYO has provided.
Use the peripheral parts with indicated value externally.
The peripheral parts value is a recommended value of oscillator manufacturer
Table 2. Subsystem clock oscillation circuit characteristics using crystal oscillator
Frequency
Manufacturer
Oscillator
Circuit parameters
Operating
supply voltage
Oscillation
stabilizing time
C3
C4
Rf
Rd2
range
typ
max
Notes
[pF]
[pF]
[Ω]
[Ω]
[V]
[s]
[s]
32.768kHz Epson Toyocom
MC-146
10
10
Open
0
2.4 to 3.6
Applicable CL
1
3
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)
Notes: 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
C1
CF
CF2
Rd
C2
XT1
Rf
C3
X’tal
XT2
Rd2
C4
Figure 1 Ceramic Oscillation Circuit
Figure 2 Crystal Oscillation Circuit
0.5VDD
Figure 3 AC Timing Measurement Point
No.A0635-18/21