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4508 Datasheet(PDF) 56 Page - Renesas Technology Corp

Part # 4508
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4508 Datasheet(HTML) 56 Page - Renesas Technology Corp

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Rev.1.02
2006.12.22
page 56 of 140
REJ03B0148-0102
4508 Group
CLOCK CONTROL
The clock control circuit consists of the following circuits.
• On-chip oscillator (internal oscillator)
• Ceramic oscillation circuit
• RC oscillation circuit
• Multi-plexer (clock selection circuit)
• Frequency divider
• Internal clock generating circuit
Fig. 49 Clock control circuit structure
The system clock and the instruction clock are generated as the
source clock for operation by these circuits.
Figure 49 shows the structure of the clock control circuit.
The 4508 Group operates by the on-chip oscillator clock (f(RING))
which is the internal oscillator after system is released from reset.
Also, the ceramic resonator or the RC oscillation can be used for the
source oscillation (f(XIN)) of the 4508 Group.
MR3, MR2
00
01
10
11
QS
R
CRCK instruction
QS
R
XOUT
XIN
Key-on wakeup signal
Instruction clock
(INSTCK)
RC oscillation circuit
Division circuit
Internal clock
generation circuit
(divided by 3)
System clock
On-chip oscillator
Multiplexer
Ceramic resonator
circuit
EPOF instruction + POF instruction
MR1
Q
RG0
Internal reset signal
MR0
0
1
f(RING)
f(XIN)
divided by 2
divided by 4
divided by 8


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