PIC18LC658-ESLASHCL datasheet(66/366 Pages) MICROCHIP

66 / 366 page

PIC18CXX8

DS30475A-page 66

Advanced Information

 2000 Microchip Technology Inc.

5.1

Control Registers

Several control registers are used in conjunction with

the TBLRD and TBLWT instructions. These include:

• RCON register

• TABLAT register

• TBLPTR registers

5.1.1

RCON REGISTER

The LWRT bit specifies the operation of Table Writes to

internal memory when the VPP voltage is applied to the

MCLR pin. When the LWRT bit is set, the controller

continues to execute user code, but long table writes

are allowed (for programming internal program mem-

ory) from user mode. The LWRT bit can be cleared only

by performing either a POR or MCLR Reset.

R/W-0

U-0

R/W-1

R/W-0

IPEN

LWRT

—

POR

BOR

bit 7

bit 0

bit 7

IPEN: Interrupt Priority Enable

= Enable priority levels on interrupts

= Disable priority levels on interrupts (16CXXX compatibility mode)

bit 6

LWRT: Long Write Enable

= Enable TBLWT to internal program memory

= Disable TBLWT to internal program memory.

Note 1: Only cleared on a POR or MCLR reset.

This bit has no effect on TBLWTs to external program memory.

bit 5

Unimplemented: Read as '0'

bit 4

RI: RESET Instruction Flag bit

= No RESET instruction occurred

= A RESET instruction occurred

bit 3

TO: Time-out bit

= After power-up, CLRWDT instruction, or SLEEP instruction

= A WDT time-out occurred

bit 2

PD: Power-down bit

= After power-up or by the CLRWDT instruction

= By execution of the SLEEP instruction

bit 1

POR: Power-on Reset Status bit

= No Power-on Reset occurred

= A Power-on Reset occurred (must be set in software after a Power-on Reset occurs)

bit 0

BOR: Brown-out Reset Status bit

= No Brown-out Reset nor POR Reset occurred

= A Brown-out Reset or POR Reset occurred

(must be set in software after a Brown-out Reset occurs)

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

’1’ = Bit is set

’0’ = Bit is cleared

x = Bit is unknown

PIC18LC658-E/CL Datasheet(PDF) 66 Page - Microchip Technology

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