PIC14000 datasheet(13/153 Pages) MICROCHIP

13 / 153 page

Preliminary

DS40122B-page 13

PIC14000

4.0

MEMORY ORGANIZATION

4.1

Program Memory Organization

The PIC14000 has a 13-bit program counter capable of

addressing an 8K x 14 program memory space. Only

the ﬁrst 4K x 14 (0000-0FFFh) are physically imple-

mented. Accessing a location above the physically

implemented address will cause a wraparound. The

reset vector is at 0000h and the interrupt vector is at

0004h (Figure 4-1).

The 4096 words of Program Memory space are divided

into:

• Address Vectors (addr 0000h-0004h)

• Program Memory Page 0 (addr 0005h-07FFH)

• Program Memory Page 1 (addr 0800h-0FBFh)

• Calibration Space (64 words, addr 0FC0h-0FFFh)

Program code may reside in Page 0 and Page 1.

FIGURE 4-1:

PIC14000 PROGRAM

MEMORY MAP AND STACK

PC<12:0>

Stack Level 1

Stack Level 8

Reset Vector

Interrupt Vector

•

CALL, RETURN,

RETFIE, RETLW

0000h

0004h

0005h

0FFFh

1000h

20FFh

07FFh

On-chip Program

Memory (Page 0)

0800h

On-chip Program

Memory (Page 1)

Calibration Space

(64 words)

0FC0h

0FBFh

4.1.1

CALIBRATION SPACE

The calibration space is not used for instructions. This

section stores constants and factors for the arithmetic

calculations to calibrate the analog measurements.

TABLE 4-1:

CALIBRATION DATA

OVERVIEW*

* Refer to AN621 for details.

** Microchip modiﬁed IEEE754 32-bit ﬂoating point format.

Refer to application note AN575 for details.

Address

Parameter

Symbol

Units

Format

0FC0h-0FC3h

Slope

reference

ratio

REF

N/A

32-bit

ﬂoating

point**

0FC4h-0FC7h

Bandgap

reference

voltage

Volts

32-bit

ﬂoating

point

0FC8h-0FCBh

Tempera-

ture sensor

voltage

THERM

Volts

32-bit

ﬂoating

point

0FCCh-0FCFh

Tempera-

ture sensor

coefﬁcient

Volts/

degree

Celsius

32-bit

ﬂoating

point

0FD0h

Internal

oscillator

frequency

multiplier

OSC

N/A

byte

0FD2h

WDT

time-out

WDT

byte

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