PIC18F2610ESLASHSOSQTP datasheet(255/376 Pages) MICROCHIP

255 / 376 page

DS39636D-page 257

PIC18F2X1X/4X1X

FIGURE 22-10:

EXTERNAL BLOCK TABLE READ (EBTRn) ALLOWED

(48-KBYTE AND 64-KBYTE DEVICES)

22.5.2

CONFIGURATION REGISTER

PROTECTION

The Configuration registers can be write-protected.

The WRTC bit controls protection of the Configuration

registers. In Normal Execution mode, the WRTC bit is

readable only. WRTC can only be written via ICSP or

an external programmer.

22.6

ID Locations

Eight memory locations (200000h-200007h) are

designated as ID locations, where the user can store

checksum or other code identification numbers. These

locations are both readable and writable during normal

execution through the TBLRD instruction; during

program/verify these locations are readable and

writable. The ID locations can be read when the device

is code-protected.

22.7

In-Circuit Serial Programming

PIC18F2X1X/4X1X microcontrollers can be serially

programmed while in the end application circuit. This is

simply done with two lines for clock and data and three

other lines for power, ground and the programming

voltage. This allows customers to manufacture boards

with unprogrammed devices and then program the

microcontroller just before shipping the product. This

also allows the most recent firmware or a custom

firmware to be programmed.

22.8

In-Circuit Debugger

When the DEBUG Configuration bit is programmed to

a ‘0’, the In-Circuit Debugger functionality is enabled.

This function allows simple debugging functions when

used with MPLAB® IDE. When the microcontroller has

this feature enabled, some resources are not available

for general use. Table 22-4 shows which resources are

required by the background debugger.

TABLE 22-4:

DEBUGGER RESOURCES

To use the In-Circuit Debugger function of the micro-

controller, the design must implement In-Circuit Serial

Programming connections to MCLR/VPP/RE3, VDD,

VSS, RB7 and RB6. This will interface to the In-Circuit

Debugger module available from Microchip or one of

the third party development tool companies.

WRTB, EBTRB = 11

WRT0, EBTR0 = 10

WRT1, EBTR1 = 11

WRT2, EBTR2 = 11

WRT3, EBTR3 = 11

TBLRD*

TBLPTR = 0008FFh

PC = 001FFEh

Program Memory

Configuration Bit Settings

Results: Table reads permitted within Blockn, even when EBTRBn = 0.

TABLAT register returns the value of the data at the location TBLPTR.

000000h

0007FFh

000800h

003FFFh

004000h

007FFFh

008000h

00BFFFh

00C000h

00FFFFh

I/O pins:

RB6, RB7

Stack:

2 levels

Program Memory:

512 bytes

Data Memory:

10 bytes

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