M38207E8FP Datasheet, PDF (42/66 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3820 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 1)
bit
bit
Low-speed mode
1/2
1/4
Middle/High-speed mode
"1"
1/2
"0"
Timer 1
"0"
"1"
Timer 2
Main clock division ratio selection bit
Middle-speed mode
Main clock stop bit
High-speed mode
or Low-speed mode
Timing φ
(Internal system clock)
QS
R
SQ
STP instruction ^WIT
R
instruction
QS
R STP instruction
Reset
Interrupt disable flag I
Interrupt request
Note : When using the low-speed mode, set the port XC switch bit to "1" .
Fig. 37 Clock generating circuit block diagram
42