M38258MCM Datasheet, PDF (40/70 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3825 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
XCIN
XCOUT
“1” “0”
Port XC switch bit
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
1/4
1/2
“0”
“0”
Middle-/High-speed mode
Timer 1
“0”
“1”
Timer 2
Main clock stop bit
Main clock division ratio selection bit
Middle-speed mode
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 using the low-speed mode, set the port X C switch bit to “1” .
Fig. 41 Clock generating circuit block diagram
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