PIC16F72 datasheet(2/14 Pages) MICROCHIP

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PIC16F72

DS39588A-page 2

Preliminary

 2002 Microchip Technology Inc.

2.0

PROGRAM MODE ENTRY

2.1

User Program Memory Map

The user memory space extends from 0x0000 to

0x07FF (2K). Table 2-1 shows the actual implementa-

tion of program memory in the PIC16F72. Configura-

tion memory begins at 0x2000, and continues to

0x3FFF. The PC will increment from 0x0000 to 0x1FFF

and wrap to 0x0000, 0x2000 to 0x3FFF and wrap

around to 0x2000 (not to 0x0000).

Once in configuration memory, the highest bit of the PC

stays a ‘1’, thus, always pointing to the configuration

memory. The only way to point to program memory is

to reset the part and re-enter Program/Verify mode, as

described in Section 2.3.

Configuration memory is selected when the PC points

to any address in the range of 0x2000-0x201F; how-

ever, only locations 0x2000 through 0x2007 are imple-

mented. Addressing locations beyond 0x201F will

access program memory (see Figure 2-1).

TABLE 2-1:

PROGRAM MEMORY

IMPLEMENTATION IN THE

PIC16F72

2.2

ID Locations

A user may store identification information (ID) in four

ID locations mapped to [0x2000:0x2003]. It is recom-

mended that each ID location word is written as

‘11 1111 1000 bbbb’

, where ‘bbbb’ is ID infor-

mation. The ID locations can be read even after code

protection is enabled.

To understand the program memory read mechanism

after code protection is enabled, refer to Section 4.0.

Table 4-1 shows specific calculations and behavior for

the PIC16F72 device.

Device

Program Memory Size

PIC16F72

0x0000 – 0x07FF (2K)

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