18F8680 datasheet(97/496 Pages) MICROCHIP

97 / 496 page

 2004 Microchip Technology Inc.

DS30491C-page 95

PIC18F6585/8585/6680/8680

If the device fetches or accesses external memory

while EBDIS = 1, the pins will switch to external bus. If

the EBDIS bit is set by a program executing from exter-

nal memory, the action of setting the bit will be delayed

until the program branches into the internal memory. At

that time, the pins will change from external bus to I/O

ports.

When the device is executing out of internal memory

(with EBDIS = 0) in Microprocessor with Boot Block

mode or Extended Microcontroller mode, the control sig-

nals will be in inactive. They will go to a state where the

AD<15:0>, A<19:16> are tri-state; the OE, WRH, WRL,

UB and LB signals are ‘1’; and ALE and BA0 are ‘0’.

TABLE 6-1:

PIC18F8X8X EXTERNAL BUS – I/O PORT FUNCTIONS

Name

Port

Bit

Function

RD0/AD0

PORTD

bit 0 Input/Output or System Bus Address bit 0 or Data bit 0

RD1/AD1

PORTD

bit 1 Input/Output or System Bus Address bit 1 or Data bit 1

RD2/AD2

PORTD

bit 2 Input/Output or System Bus Address bit 2 or Data bit 2

RD3/AD3

PORTD

bit 3 Input/Output or System Bus Address bit 3 or Data bit 3

RD4/AD4

PORTD

bit 4 Input/Output or System Bus Address bit 4 or Data bit 4

RD5/AD5

PORTD

bit 5 Input/Output or System Bus Address bit 5 or Data bit 5

RD6/AD6

PORTD

bit 6 Input/Output or System Bus Address bit 6 or Data bit 6

RD7/AD7

PORTD

bit 7 Input/Output or System Bus Address bit 7 or Data bit 7

RE0/AD8

PORTE

bit 0 Input/Output or System Bus Address bit 8 or Data bit 8

RE1/AD9

PORTE

bit 1 Input/Output or System Bus Address bit 9 or Data bit 9

RE2/AD10

PORTE

bit 2 Input/Output or System Bus Address bit 10 or Data bit 10

RE3/AD11

PORTE

bit 3 Input/Output or System Bus Address bit 11 or Data bit 11

RE4/AD12

PORTE

bit 4 Input/Output or System Bus Address bit 12 or Data bit 12

RE5/AD13

PORTE

bit 5 Input/Output or System Bus Address bit 13 or Data bit 13

RE6/AD14

PORTE

bit 6 Input/Output or System Bus Address bit 14 or Data bit 14

RE7/AD15

PORTE

bit 7 Input/Output or System Bus Address bit 15 or Data bit 15

RH0/A16

PORTH

bit 0 Input/Output or System Bus Address bit 16

RH1/A17

PORTH

bit 1 Input/Output or System Bus Address bit 17

RH2/A18

PORTH

bit 2 Input/Output or System Bus Address bit 18

RH3/A19

PORTH

bit 3 Input/Output or System Bus Address bit 19

RJ0/ALE

PORTJ

bit 0 Input/Output or System Bus Address Latch Enable (ALE) Control pin

RJ1/OE

PORTJ

bit 1 Input/Output or System Bus Output Enable (OE) Control pin

RJ2/WRL

PORTJ

bit 2 Input/Output or System Bus Write Low (WRL) Control pin

RJ3/WRH

PORTJ

bit 3 Input/Output or System Bus Write High (WRH) Control pin

RJ4/BA0

PORTJ

bit 4 Input/Output or System Bus Byte Address bit 0

RJ5/CE

PORTJ

bit 5 Input/Output or Chip Enable

RJ6/LB

PORTJ

bit 6 Input/Output or System Bus Lower Byte Enable (LB) Control pin

RJ7/UB

PORTJ

bit 7 Input/Output or System Bus Upper Byte Enable (UB) Control pin

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