M30222 Datasheet, PDF (21/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
Specifications in this manual are tentative and subject to change
M30222 Group
Rev. G
Clock Generating Circuit
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Microcomputer
(Built-in feedback resistor)
X cin
Xcout
(Note 1)
R
Ccin
Ccout
Microcomputer
Xcin
Xcout
Open
Externally derived clock
VDC (Note 2)
Vss
Note 1: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive
capacity setting. Use the value recommended by the maker of the oscillator.
When the oscillation drive capacity is set to low, check that oscillation is stable. Also, if the oscillator manufacturer's
data sheet specifies that a feedback resistor be added external to the chip, insert a feedback resistor between X cin
and Xcout following the instruction.
Note 2: Reference XCin to VDC supply.
Fig. 1.12. Examples of sub-clock
Figure 1.13 shows a block diagram of the clock generating circuit.
XCIN
CM04
XCOUT
CM10 "1"
Write signal
RESET
Software reset
NMI
Interrupt request
level judgment
output
WAIT instruction
SQ
R
SQ
R
Sub clock
XIN
XOUT
Main clock
CM05
CM02
1/32
CM14=1
fC1
fC132
fC32 ^CM14=0
f1
fC
fAD
f8
f32
bc
a _Divider d
CM07=0
fC
CM07=1
BCLK
CM0i : Bit i at address 000616
CM1i : Bit i at address 000716
WDCi : Bit i at address 000F16
b
c
a
1/2
1/2
1/2
1/2
1/2
CM06=1
CM06=0
CM17,CM16=10
CM06=0
CM17,CM16=11
d
CM06=0
CM17,CM16=01
CM06=0
CM17,CM16=00
Details of divider
Fig. 1.13. Clock generating circuit
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