MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
XCIN
XCOUT
OSC1 oscillating
mode selection bits
Timer 4 count
stop bit (Notes 1, 2)
Timer 3 count
stop bit (Notes 1, 2)
(Notes 1, 4)
XIN
XOUT
“1”
“1”
“0”
Timer 3
Timer 4
1/8
1/2
“0”
Internal system clock
selection bit (Notes 1, 3)
Timer 3
count source selection bit (Notes 1, 2)
Timing
(Internal clock)
Main clock (XIN–XOUT) stop bit (Notes 1, 3)
Internal system clock
selection bit (Notes 1, 3)
Q
S
R
S
Q
Q
S
R
Reset
WIT
instruction
R
STP instruction
STP instruction
Reset
Interrupt disable flag I
Interrupt request
Notes 1 : The value at reset is “0.”
2 : Refer to the structure of timer mode register 2.
3 : Refer to the structure of CPU mode register (next page).
4 : Refer to the structure of clock source control register.
Fig. 93. Clock generating circuit block diagram
80
MITSUBISHI [ Mitsubishi Group ]
