PIC16F87 datasheet(5/24 Pages) MICROCHIP

5 / 24 page

 2002 Microchip Technology Inc.

DS39607B-page 5

PIC16F87/88

3.0

PROGRAM MODE ENTRY

3.1

User Program Memory Map

The user memory space extends from 0x0000 to

0x1FFF (8K), of which 4K (0000h-0FFFh) is physically

implemented. In Programming mode, the program

memory space extends from 0x0000 to 0x3FFF, with

the first half (0x0000-0x1FFF) being user program

memory and the second half (0x2000-0x3FFF) being

configuration memory. The PC will increment from

0x0000 to 0x0FFF, then increment to 0x1000 and

access 0x0000. Once the PC reaches 0x1FFF, it will

increment to 0x2000. From 0x2000, the PC will

increment up to 0x3FFF and wrap around to 0x2000

(not to 0x0000). Once in configuration memory, the

highest bit of the PC stays a ‘1’, always pointing to the

configuration memory. The only way to point to user

program memory is to reset the part and re-enter

Program mode, as described in Section 3.4 “Program

Mode”.

In the configuration memory space, 0x2000-0x201F

are physically implemented. However, only locations

0x2000 through 0x2008 are available. Other locations

are reserved. Locations beyond 0x201F will physically

access user memory (see Figure 3-1).

3.2

Data EEPROM Memory

The EEPROM data memory space is a separate block

of high-endurance memory that the user accesses

using a special sequence of instructions. The amount

of data EEPROM memory depends on the device and

is shown below in number-of-bytes.

The contents of data EEPROM memory have the

capability to be embedded into the HEX file.

The programmer should be able to read data EEPROM

information from a HEX file and conversely (as an

option) write data EEPROM contents to a HEX file,

along

with

program

memory

information

and

configuration bit information.

The 256 data memory locations are logically mapped

and use PC<7:0>. The format for data memory storage

is one data byte per address location, LSb aligned.

Device

Program Flash

PIC16F87

PIC16F88

Device

# of Bytes

PIC16F87

256

PIC16F88

256

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