M38C2XMX Datasheet, PDF (49/63 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
38C2 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
System clock
control bits
“00,10,11”
“01”
P61/XCIN P62/XCOUT
“00,10,11”
“01”
System clock
control bits
System clock
control bits
“00,10”
Frequency divider for Timer
XI N
XOUT
“01,11”
Timer 1 count source
selection bits
“01”
Timer 1
“00”
1/2
Timer 2 count source
selection bits
“00”
Timer 2
“10”
System clock
control bits
“01,10,11”
“00”
1/2
1/2 1/2
Main clock
division ratio
selection bits _{System clock}
Frequency/8_{“0m0o”} de
“00”
Frequency/4 mode _{“01”}
Frequency/2 mode “10”
Through mode “11”
control bits
“00,10”
“01,11”
System clock φ
QS
R STP instruction
WIT instruction
SQ
R
QS
R STP instruction
Reset
Interrupt disable flag I
Interrupt request
Fig. 52 Clock generating circuit block diagram
49