Renesas PCA7400 Manual do Utilizador descarregar pdf (Página 78)

MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

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

and ON-SCREEN DISPLAY CONTROLLER

Fig. 88. Setting value of interrpt interval determination control

Fig. 86. Block diagram of interrupt interval determination circuit

Fig. 87. Structure of interrupt interval determination control

INT1 or INT2 input

Count interval

Bit i (i = 3, 4) of interrupt interval determination

control register (address 0211

)

Data bus

Control

circuit

Connected to

black colored

side at rest.

Selection gate :

(Address 0211

)

32µs

16µs

8-bit binary up counter (8)

Interrupt interval determination register(8)

INT1 (Note)

INT2 (Note)

Note: The pulse width of external interrupt INT1 and INT2 needs 5 or more machine cycles.

RE: Input interval determination control register

Interrupt interval determination

control register

(RE : address 0212

16)

Interrupt interval determination

circuit operation control bit

0 : Stopped

1 : Operating

External interrupt input pin

selection bit

0 : INT1 input

1 : INT2 input

INT1 pin input polarity switch bit

0 : Positive polarity input

1 : Negative polarity input

INT2 pin input polarity switch bit

0 : Positive polarity input

1 : Negative polarity input

Interrupt interval determination mode

switch bit

0 : Interrupt interval determination

mode

1 : Pulse width determination mode

Reference clock control selection

bit

(at f(X

IN) = 8MHz)

0 : 32µs

1 : 16µs

INT3 pin input polarity switch bit

0 : Positive polarity input

1 : Negative polarity input

A-D conversion · INT3 interrupt

source selection bit

0 : INT3 interrupt

1 : A-D conversion interrupt

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 97 98

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