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XCIN
XCOUT
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Timer 1 count
Timer 2 count
XIN
XOUT Internal system clock selection bit
source selection
source selection
(Note)
bit
bit
Low-speed mode
“1”
“1”
1/2
“0”
Middle-/High-speed mode
1/4
1/2
“0”
Timer 1
“0”
“1”
Timer 2
Main clock stop bit
Main clock division ratio selection bit
Middle-speed mode
“1”
“0”
High-speed mode
or Low-speed mode
Timing φ
(Internal clock)
QS
R
STP instruction
SQ
WIT
R
instruction
QS
R STP instruction
Reset
Interrupt disable flag I
Interrupt request
Note: When selecting the XC oscillation, set the port XC switch bit to “1” .
Fig. 38 Clock generating circuit block diagram
38