LC877424A Datasheet, PDF (18/22 Pages) Sanyo Semicon Device – 8 Bit Single Chip Microcontroller Incorporating 48K/40K/32K/24K Byte ROM and 1536 byte RAM on Chip

LC877448A/40A/32A/24A
Subsystem clock oscillation circuit characteristics
The characteristics in the table bellow is based on the following conditions:
1. Use the standard evaluation board SANYO has provided.
2. Use the peripheral parts with indicated value externally.
3. 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
C3
C4
Rf
Rd2
[pF] [pF]
[Ω]
[kΩ]
Operating supply
voltage range
[V]
Oscillation
stabilizing time
typ
max
[S]
[S]
Notes
32.768kHz SEIKO EPSON
MC-306
18
18 OPEN 390
2.5 to 6.0
Applicable
1.1
3.0
CL 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. (Refer to Figure 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
CF2
Rd1
C1
CF
C2
Figure 1 Ceramic oscillation circuit
XT1
C3
XT2
Rf
Rd2
C4
X’tal
Figure 2 Crystal oscillation circuit
0.5VDD
Figure 3 AC timing measurement point
No.7776-18/22