PIC18F44J10-ESLASHML datasheet(242/358 Pages) MICROCHIP

242 / 358 page

PIC18F45J10 FAMILY

DS39682C-page 240

Preliminary

20.6

Program Verification and

Code Protection

For all devices in the PIC18F45J10 family of devices,

the on-chip program memory space is treated as a

single block. Code protection for this block is controlled

by one configuration bit, CP0. This bit inhibits external

reads and writes to the program memory space. It has

no direct effect in normal execution mode.

20.6.1

CONFIGURATION REGISTER

PROTECTION

The Configuration registers are protected against

untoward changes or reads in two ways. The primary

protection is the write-once feature of the configuration

bits which prevents reconfiguration once the bit has

been programmed during a power cycle. To safeguard

against unpredictable events, configuration bit changes

resulting from individual cell-level disruptions (such as

ESD events) will cause a parity error and trigger a

device Reset.

The data for the Configuration registers is derived from

the Flash Configuration Words in program memory.

When the CP0 bit is set, the source data for device

configuration is also protected as a consequence.

20.7

In-Circuit Serial Programming

PIC18F45J10 family 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.

20.8

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 20-3 shows which resources are

required by the background debugger.

TABLE 20-3:

DEBUGGER RESOURCES

I/O pins:

RB6, RB7

Stack:

2 levels

Program Memory:

512 bytes

Data Memory:

32 bytes

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