Renesas PCA7400 Manuel d'utilisateur télécharger pdf (Page 83)

MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

Fig. 95. Clock generating circuit block diagram

CIN

COUT

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

–X

OUT

) stop bit (Notes 1, 3)

STP instruction

WIT

instruction

Reset

Interrupt disable flag I

Interrupt request

Reset

STP instruction

Timing φ

(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

OUT

“1”

“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.

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 97 98

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Renesas PCA7400 Manuel d'utilisateur Page 83

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