LC877264A Datasheet, PDF (21/24 Pages) Sanyo Semicon Device – 8-Bit Single Chip Microcontroller with 64/56/48 KB ROM and 2048-Byte RAM On Chip

LC877264A/56A/48A
Main system 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
Frequency
10MHz
Table 1. Main system clock oscillation circuit characteristics using ceramic resonator
Manufacturer
Oscillator
Operating
Oscillation
Circuit parameters
supply voltage stabilizing time
Notes
C1 C2 Rd1
range
typ max
Murata
CSA10.0MTZ 33pF 33pF 470Ω 4.5 – 6.0V 0.06ms 0.3ms
CST10.0MTW (30pF) (30pF) 470Ω 4.5 – 6.0V 0.06ms 0.3ms Built in C1,C2
4MHz
Murata
CSA4.00MG 33pF 33pF 680Ω 2.5 – 6.0V 0.05ms 0.2ms
CST4.00MGW (30pF) (30pF) 680Ω 2.5 – 6.0V 0.05ms 0.2ms Built in 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. 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
Operating
Oscillation
supply voltage stabilizing time Notes
C3 C4 Rf Rd2
range
typ max
32.768MHz Seiko EPSON C-002RX 18pF 18pF OPEN 390kΩ 2.5 – 6.0V
1.0s 3.0s
MC-306
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 Figure4)
(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
Rf
X’tal
XT2
Rd2
C4
Figure 2 Crystal oscillation circuit
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