PIC18C801T-I/L【PDF 17/319 页】IC MCU ROMLESS A/D PWM 84PLCC

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2001 Microchip Technology Inc.

Advance Information

DS39541A-page 113

PIC18C601/801

9.5

PORTE, TRISE and LATE

Registers

PORTE is an 8-bit wide, bi-directional port. The corre-

sponding data direction register is TRISE. Setting a

TRISE bit (= 1) will make the corresponding PORTE pin

an input (i.e., put the corresponding output driver in a

Hi-Impedance mode). Clearing a TRISE bit (= 0) will

make the corresponding PORTE pin an output (i.e., put

the contents of the output latch on the selected pin).

Read-modify-write operations on the LATE register

reads and writes the latched output value for PORTE.

PORTE is an 8-bit port with Schmitt Trigger input buff-

ers. Each pin is individually configurable as an input or

output. PORTE is multiplexed with several peripheral

functions (Table 9-9).

PORTE is multiplexed with the system bus and is avail-

able only when the system bus is disabled, by setting

EBDIS bit in register MEMCON. When operating as the

system bus, PORTE is configured as the high order

byte of the address/data bus (AD15:AD8), or as the

high order address byte (A15:A8), if address and data

buses are de-multiplexed.

EXAMPLE 9-5:

INITIALIZING PORTE

FIGURE 9-9:

PORTE BLOCK DIAGRAM IN I/O MODE

Note:

On Power-on Reset, PORTE defaults to

the system bus.

CLRF

PORTE

; Initialize PORTE by

; clearing output

; data latches

CLRF

LATE

; Alternate method

; to clear output

; data latches

MOVLW

03h

; Value used to

; initialize data

; direction

MOVWF

TRISE

; Set RE1:RE0 as inputs

; RE7:RE2 as outputs

Peripheral Out Select

Data Bus

WR LATE

WR TRISE

Data Latch

TRIS Latch

RD TRISE

Peripheral Data Out

VDD

VSS

RD PORTE

Peripheral Data In

I/O pin(1)

WR PORTE

RD LATE

Schmitt

Trigger

Note 1: I/O pins have diode protection to VDD and VSS.

TRIS

Override

Peripheral Enable

TRIS OVERRIDE

Pin

Override

Peripheral

RE0

Yes

External Bus

RE1

Yes

External Bus

RE2

Yes

External Bus

RE3

Yes

External Bus

RE4

Yes

External Bus

RE5

Yes

External Bus

RE6

Yes

External Bus

RE7

Yes

External Bus

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