User`s manual

120
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37281MAH–XXXSP,M37281MFH–XXXSP
M37281MKH–XXXSP,M37281EKSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
Fig.8.14.3 Clock Generating Circuit Block Diagram
X CIN X COUT
OSC1 oscillating
mode selection bits
(See notes 1, 4)
Internal system clock
selection bit (See notes 1, 3)
Internal system clock
selection bit (Notes 1, 3)
Main clock (X
IN –X OUT ) stop bit (Notes 1, 3)
R
SQ
STP instruction
WIT
instruction
R
S
Q
Reset
Interrupt disable flag I
Interrupt request
R
S
Q
Reset
STP instruction
Timing φ
(Internal clock)
Timer 3
count source selection bit (See notes 1, 2)
“1”
Timer 3 count
stop bit (See notes 1, 2)
Timer 4 count
stop bit (See notes 1, 2)
Timer 3 Timer 4
1/2
1/8
X
OUT X IN
“1”
“0”
“0”
Notes 1 : The value at reset is “0.”
2:Refer to timer mode register 2.
3:Refer to CPU mode register (next page).
4:Refer to clock source control register.