MITSUBISHI MICROCOMPUTERS
3822 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
XCOUT
XCIN
“1”
“0”
Port XC switch bit
Timer 1 count
source selection
bit
Timer 2 count
source selection
bit
Internal system clock selection bit
(Note)
XIN
XOUT
Low-speed mode
“1”
“1”
“0”
Timer 1
Timer 2
1/2
1/2
1/4
“0”
Middle-/High-speed mode
“0”
“1”
Main clock division ratio selection bit
Middle-speed mode
“1”
“0”
Timing φ
(Internal system clock)
High-speed mode
or Low-speed mode
Main clock stop bit
Q
Q
S
R
S
R
S
R
Q
WIT
instruction
STP instruction
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.44 Clock generating circuit block diagram
44
MITSUBISHI [ Mitsubishi Group ]
