LC87F57C8A Datasheet, PDF (24/28 Pages) Sanyo Semicon Device – 8 BIT SINGLE CHIP MICROCONTROLLER

LC87F57C8A
Main System Clock Oscillation Circuit Characteristics
The characteristics in the table bellow is based on the following conditions:
1. Using the standard oscillation evaluation board SANYO has provided.
2. Using the external peripheral parts with the indicated value.
3. The recommended circuit parameters for the peripheral parts are verified by the oscillator manufacturer.
Table 1. Recommended circuit parameters for the main system clock using the ceramic resonator
Recommended circuit Operating Oscillation stabilizing
Frequency Manufacturer Oscillator
parameters
supply
time
Note
C1 C2 Rd1 voltage range typ
max
10MHz
MURATA
CSLS10M0G53-
B0
(15pF) (15pF)
0
4.5 – 5.5V 0.03ms 0.30ms Internal C1,C2
CSTCE10M0G52-
R0
(10pF) (10pF)
0
4.5 – 5.5V 0.03ms 0.30ms Internal C1,C2
5MHz
MURATA
CSTLS5M00G53-
B0
(15pF) (15pF)
0Ω
CSTCR5M00G53
-R0
(15pF) (15pF)
0Ω
2.5 – 5.5V
2.5 – 5.5V
0.03ms
0.03ms
0.30ms _{Internal C1,C2}
0.30ms Internal C1,C2
*The oscillation stabilizing time is a period until the oscillation becomes stable after VDD becomes higher
than minimum operating voltage. (Refer to Figure4)
Subsystem Clock Oscillation Circuit Characteristics
The characteristics in the table bellow is based on the following conditions:
1. Using the standard oscillation evaluation board SANYO has provided.
2. Using the external peripheral parts with the indicated value.
3. The recommended circuit parameters for the peripheral parts are verified by the oscillator manufacturer.
Table 2. Recommended circuit parameters for the subsystem clock using the crystal oscillation
Recommended circuit
Operating
Oscillation stabilizing
Frequency Manufacturer Oscillator
Parameters
supply voltage
time
Note
C3 C4 Rf Rd2
range
typ
max
32.768kHz SEIKO EPSON MC-306 9pF 9pF OPEN 820kΩ 2.5 – 5.5V
1.5s
3s
*The oscillation stabilizing time is the period until the oscillation becomes stable, after executing the
instruction which starts the sub-clock oscillator or after releasing a HOLD mode. (Refer to Figure4)
(Notes) Since the oscillation frequency precision is affected by the circuit pattern, place the oscillation
related parts as close to the oscillation pins as possible, using the shortest possible pattern length.
CF1
CF2
Rd1
C1
CF
C2
Figure 1 Ceramic oscillation circuit
XT1
C3
Rf
X’tal
XT2
Rd2
C4
Figure 2 Crystal oscillation circuit
24/27
0.5VDD
Figure 3 AC timing point
Ver.1.00