W78E58 데이터 시트보기 (PDF) - Winbond

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W78E58

8-BIT MICROCONTROLLER

Winbond 

W78E58

EX3: External interrupt 3 enable if set

IE3: If IT3 = 1, IE3 is set/cleared automatically by hardware when interrupt is detected/serviced

IT3: External interrupt 3 is falling-edge/low-level triggered when this bit is set/cleared by software

PX2: External interrupt 2 priority high if set

EX2: External interrupt 2 enable if set

IE2: If IT2 = 1, IE2 is set/cleared automatically by hardware when interrupt is detected/serviced

IT2: External interrupt 2 is falling-edge/low-level triggered when this bit is set/cleared by software

Eight-source interrupt informations:

INTERRUPT

SOURCE

VECTOR

ADDRESS

POLLING

SEQUENCE WITHIN

PRIORITY LEVEL

ENABLE

REQUIRED

SETTINGS

External Interrupt 0

03H

0 (highest)

IE.0

Timer/Counter 0

0BH

1

IE.1

External Interrupt 1

13H

2

IE.2

Timer/Counter 1

1BH

3

IE.3

Serial Port

23H

4

IE.4

Timer/Counter 2

2BH

5

IE.5

External Interrupt 2

33H

6

XICON.2

External Interrupt 3

3BH

7 (lowest)

XICON.6

INTERRUPT

TYPE

EDGE/LEVEL

TCON.0

-

TCON.2

-

-

-

XICON.0

XICON.3

2. PORT4

Another bit-addressable port P4 is also available and only 4 bits (P4<3:0>) can be used. This port

address is located at 0D8H with the same function as that of port P1, except the P4.3 and P4.2 are

alternative function pins. It can be used as general I/O pins or external interrupt input sources (INT2 /

INT3 ).

Example:

P4

REG 0D8H

MOV P4, #0AH ; Output data "A" through P4.0−P4.3.

MOV A, P4

; Read P4 status to Accumulator.

SETB P4.0

; Set bit P4.0

CLR P4.1

; Clear bit P4.1

3. Reduce EMI Emission

Because of the large on-chip flash EEPROM, when a program is running in internal ROM space, the

ALE will be unused. The transition of ALE will cause noise, so it can be turned off to reduce the EMI

Publication Release Date: November 1997

-9-

Revision A2

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