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PIC17CXX

EPROM Memory Programming Speci鏗乧ation

This document includes the programming

speci鏗乧ations for the following devices:

鈥?PIC17C42

鈥?PIC17C42A

鈥?PIC17CR42

鈥?PIC17C43

鈥?PIC17CR43

鈥?PIC17C44

Pin Diagram

40L PDIP, Windowed CERDIP

V

DD

RC0/AD0

RC1/AD1

RC2/AD2

RC3/AD3

RC4/AD4

RC5/AD5

RC6/AD6

RC7/AD7

V

SS

RB0/CAP1

RB1/CAP2

RB2/PWM1

RB3/PWM2

RB4/TCLK12

RB5/TCLK3

RB6

RB7

OSC1/CLKIN

OSC2/CLKOUT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

RD0/AD8

RD1/AD9

RD2/AD10

RD3/AD11

RD4/AD12

RD5/AD13

RD6/AD14

RD7/AD15

MCLR/V

PP

V

SS

RE0/ALE

RE1/OE

RE2/WR

TEST

RA0/INT

RA1/T0CKI

RA2

RA3

RA4/RX/DT

RA5/TX/CK

1.0

PROGRAMMING THE PIC17CXX

The PIC17CXX is programmed using the TABLWT

instruction. The table pointer points to the internal

EPROM location start. Therefore, a user can program

an EPROM location while executing code (even from

internal EPROM). This programming speci鏗乧ation

applies to PIC17CXX devices in all packages.

For the convenience of a programmer developer, a

鈥減rogram & verify鈥?routine is provided in the on-chip test

program memory space, the program resides in ROM

and not EPROM. Therefore, it is not erasable. The

鈥減rogram/verify鈥?routine allows the user to load any

address, program a location, verify a location or incre-

ment to the next location. It allows variable program-

ming pulse width.

PIC17CXX

1.1

Hardware Requirements

The PIC17CXX requires two programmable power

supplies, one for V

DD

(2.5V to 6.0V recommended) and

one for V

PP

(13

鹵

0.25V). Both supplies should have a

minimum resolution of 0.25V.

The PIC17CXX uses an intelligent algorithm. The algo-

rithm calls for program veri鏗乧ation at V

DD

min as well as

V

DD

max. Veri鏗乧ation at V

DD

min guarantees good

鈥渆rase margin鈥? Veri鏗乧ation at V

DD

max guarantees

good 鈥減rogram margin鈥? Three times (3X) additional

pulses will increase program margin then beyond V

DD

(max.) and insure safe operation in user system.

Since the PIC17CXX under programming is actually

executing code from 鈥渂oot ROM,鈥?a clock must be pro-

vided to the part. Furthermore, the PIC17CXX under

programming may have any oscillator con鏗乬uration

(EC, XT, LF or RC). Therefore, the external clock driver

must be able to overdrive pulldown in RC mode. CMOS

drivers are required since the OSC1 input has a

Schmitt trigger input with levels (typically) of 0.2V

DD

and 0.8V

DD

. See the PIC17C4X data sheet

(DS30412A) for exact speci鏗乧ations.

PIN DESCRIPTIONS (DURING PROGRAMMING): PIC17C42/42A/43/44

During Programming

Pin Name

RA <0:4>

TEST

RB <7:0>

RC <7:0>

MCLR/V

PP

V

DD

V

SS

Pin Name

RA <0:4>

TEST

PAD <15:8>

PAD <7:0>

V

PP

V

DD

V

SS

Pin Type

I

I

I/O

I/O

P

P

P

Pin Description

Necessary in programming mode

Must be set to 鈥渉igh鈥?to enter programming mode

Address & data: high byte

Address & data: low byte

Programming Power

Power Supply

Ground

Legend: I = Input, O = Output, P = Power

1996 Microchip Technology Inc.

DS30139I-page 1

This document was created with FrameMaker 4 0 4

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