MITSUBISHI MICROCOMPUTERS
3827 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
XCOUT
XCIN
Timer 1 count
source selection
bit
Timer 2 count
source selection
bit
Internal system clock selection bit
XIN
XOUT
(Note)
Low-speed mode
“0”
“1”
“0”
Timer 1
Timer 2
1/2
1/2
1/4
“1”
Middle-/High-speed mode
“0”
“1”
Main clock division ratio selection bit
Middle-speed mode
“1”
Timing φ
(Internal clock)
“0”
High-speed mode
or Low-speed mode
Main clock stop bit
Q
S
R
S
R
Q
Q
S
R
WIT
instruction
STP instruction
STP instruction
Reset
Interrupt disable flag I
Interrupt request
Note: When selecting the XC oscillation, set the port XC switch bit to “1” .
Fig. 53 Clock generating circuit block diagram
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MITSUBISHI [ Mitsubishi Group ]
