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6V7 Datasheet(PDF) 38 Page - Renesas Technology Corp

Part # 6V7
Description  SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
PDF  298 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

6V7 Datasheet(HTML) 38 Page - Renesas Technology Corp

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Rev.1.00
May 18, 2004
page 38 of 296
M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP
2.5.3 Clock Control
Figure 2.5.4 shows the block diagram of the clock generating circuit.
Sub clock
CM04
fC32
CM0i : Bit i at address 000616
CM1i : Bit i at address 000716
WDCi : Bit i at address 000F16
XCIN
CM10 “1”
Write signal
1/32
XCOUT
Q
S
R
WAIT instruction
XOUT
Main clock
CM05
fC
CM02
f1
Q
S
R
Interrupt request
level judgment
output
RESET
Software reset
fC
CM07=0
CM07=1
fAD
Divider
a
d
1/2
1/2
1/2
1/2
CM06=0
CM17,CM16=00
CM06=0
CM17,CM16=01
CM06=0
CM17,CM16=10
CM06=1
CM06=0
CM17,CM16=11
d
a
Details of divider
XIN
f8
f32
c
b
b
1/2
c
f32SIO2
f8SIO2
f1SIO2
BCLK
Figure 2.5.4 Clock generating circuit
2.5.2 OSD Oscillation Circuit
The OSD clock oscillation circuit can be chosen to be an external oscillator circuit comprised of an LC
oscillator or a ceramic resonator (or a quartz-crystal oscillator) connected between the OSC1 and OSC2
pins, or an internal oscillator circuit with a filter connected to the OSC1 pin. Which of LC oscillator or a
ceramic resonator (or a quartz-crystal oscillator) is selected by setting bits 0, 1 and 2 of the clock control
register (address 020516).
Figure 2.5.3 OSD clock connection example
OSC2
OSC1
L
C1
C2
Microcomputer
OSC2
OSC1
1K
Ω
0.015
µF
2pF
Microcomputer
OPEN
Connecting an external oscillator circuit
Connecting an internal oscillator circuit
Note: When mounting a resistor and capacitors,
use the shortest possible wiring to prevent leakage.



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