M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 87

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Fig. 4.10.3 Circuit of INT
4.10.1 Function of INT
(1) Selecting edge sense mode
(2) Selecting level sense mode
INT
The interrupt request bit has the same function as that of internal interrupts. That is, when an
interrupt request occurs, the interrupt request bit is set to “1.” The bit remains set to “1” until the
interrupt request is accepted; it is cleared to “0” when the interrupt request is accepted. By software,
this bit also can be set to “0” in order to clear the interrupt request or “1” in order to generate the
interrupt request.
The INT
In this case, the interrupt request occurs continuously while the level of the INT
When the INT
request is accepted, this interrupt request is not retained. (Refer to Figure 4.10.4.)
Valid level
Invalid level
i
pin
___
i
interrupt request bit becomes ignored.
___
1
: This means the level which is selected by the polarity select bit (bit 4 at addresses 7D
to 7F
2
i
___
: This means the reversed level of a valid level.
pin level changes from the valid level to the invalid level
___
Edge detection
circuit
i
16
interrupt request bit
i
).
Interrupt
7702/7703 Group User’s Manual
Interrupt request bit
Data bus
4.10 External interrupts (INT
“0”
“1”
Level sense/Edge sense
select bit
INTERRUPTS
2
before the INT
___
Interrupt request
i
pin is valid level
___
i
___
interrupt)
i
interrupt
4–23
16
1
.