Renesas PCA7401 Informations techniques Page 83

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MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
80
Fig. 93. Clock generating circuit block diagram
XCIN XCOUT
OSC1 oscillating
mode selection bits
(Notes 1, 4)
Internal system clock
selection bit (Notes 1, 3)
Internal system clock
selection bit (Notes 1, 3)
Main clock (X
IN–XOUT) 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
(Internal clock)
Timer 3
count source selection bit (Notes 1, 2)
“1”
Timer 3 count
stop bit (Notes 1, 2)
Timer 4 count
stop bit (Notes 1, 2)
Timer 3 Timer 4
1/2
1/8
X
OUTXIN
“1”
“0”
“0”
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.
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