LC87F7032A Datasheet, PDF (18/21 Pages) Sanyo Semicon Device – CMOS IC FROM 32K byte, RAM 1024 byte on-chip 8-bit 1-chip Microcontroller

LC87F7032A
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 Rd1
[pF] [pF] [Ω]
Operating
supply voltage
range
[V]
Oscillation
stabilizing time
typ
max
[ms]
[ms]
4.00MHz
Murata
SMD
Lead
CSTCR4M00G53-R0
CSTLS4M00G53-B0
(15) (15)
1k
(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
Built in
C1, C2
Subsystem Clock Oscillator 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
C3
Circuit Constant
C4
Rf
Operating
Oscillation
supply
Stabilization Time
Rd2
voltage range
typ
max
Notes
[pF]
[pF]
[Ω]
[Ω]
[V]
[s]
[s]
32.768kHz Epson Toyocom
MC-146
3
3
Open
0
2.4 to 3.6
1
Applicable
3
CL value=7.0pF
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
Rd1
C1
CF
C2
Figure 1 Ceramic Oscillator Circuit
XT1
XT2
Rf
Rd2
C3
C4
X’tal
Figure 2 Crystal Oscillator Circuit
0.5VDD
Figure 3 AC Timing Measurement Point
No.A0653-18/21