Datasheet > PIC17CXX

PIC17CXX

更新时间： 2024-09-19 22:22:39

品牌	Logo	应用领域
美国微芯 - MICROCHIP		存储可编程只读存储器电动程控只读存储器
页数	文件大小	规格书
16页	140K
描述
EPROM Memory Programming Specification

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PIC17CXX 数据手册

PIC17CXX

EPROM Memory Programming Speciﬁcation

This document includes the programming

speciﬁcations for the following devices:

Pin Diagram

40L PDIP, Windowed CERDIP

• PIC17C42

• PIC17C42A

• PIC17CR42

• PIC17C43

• PIC17CR43

• PIC17C44

VDD

RC0/AD0

RC1/AD1

RC2/AD2

RC3/AD3

RC4/AD4

RC5/AD5

RC6/AD6

RC7/AD7

VSS

RD0/AD8

RD1/AD9

RD2/AD10

RD3/AD11

RD4/AD12

RD5/AD13

RD6/AD14

RD7/AD15

MCLR/VPP

VSS

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 speciﬁcation

applies to PIC17CXX devices in all packages.

RB0/CAP1

RB1/CAP2

RB2/PWM1

RB3/PWM2

RB4/TCLK12

RB5/TCLK3

RB6

RE0/ALE

RE1/OE

For the convenience of a programmer developer, a

“program & verify” 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

“program/verify” 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.

RE2/WR

TEST

RA0/INT

RA1/T0CKI

RA2

RB7

RA3

OSC1/CLKIN

OSC2/CLKOUT

RA4/RX/DT

RA5/TX/CK

1.1

Hardware Requirements

The PIC17CXX requires two programmable power

supplies, one for VDD (2.5V to 6.0V recommended) and

one for VPP (13 ± 0.25V). Both supplies should have a

minimum resolution of 0.25V.

Since the PIC17CXX under programming is actually

executing code from “boot ROM,” a clock must be pro-

vided to the part. Furthermore, the PIC17CXX under

programming may have any oscillator conﬁguration

(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 0.2VDD

and 0.8VDD. See the PIC17C4X data sheet

(DS30412A) for exact speciﬁcations.

The PIC17CXX uses an intelligent algorithm. The algo-

rithm calls for program veriﬁcation at VDDmin as well as

VDDmax. Veriﬁcation at VDDmin guarantees good

“erase margin”. Veriﬁcation at VDDmax guarantees

good “program margin”. Three times (3X) additional

pulses will increase program margin then beyond VDD

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

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

During Programming

Pin Name

Pin Type

Pin Description

RA <0:4>

TEST

RA <0:4>

TEST

Necessary in programming mode

Must be set to “high” to enter programming mode

Address & data: high byte

Address & data: low byte

Programming Power

RB <7:0>

RC <7:0>

MCLR/VPP

VDD

PAD <15:8>

PAD <7:0>

VPP

I/O

VDD

Power Supply

VSS

Ground

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

1996 Microchip Technology Inc.

DS30139I-page 1

This document was created with FrameMaker 4 0 4

12 3 4 5 6 7...16

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与PIC17CXX相关器件

型号	品牌	获取价格	描述	数据表
PIC17FR42A25I/L	MICROCHIP	获取价格	PIC17FR42A25I/L
PIC17FR43-25/PQ	MICROCHIP	获取价格	PIC17FR43-25/PQ
PIC17FR43-25I/PQ	MICROCHIP	获取价格	PIC17FR43-25I/PQ
PIC17FR43-33/P	MICROCHIP	获取价格	PIC17FR43-33/P
PIC17FR44-08I/PT	MICROCHIP	获取价格	PIC17FR44-08I/PT
PIC17FR44-16/P	MICROCHIP	获取价格	PIC17FR44-16/P
PIC17FR44-16I/PT	MICROCHIP	获取价格	PIC17FR44-16I/PT
PIC17FR44-25/L	MICROCHIP	获取价格	PIC17FR44-25/L
PIC17FR44-25/P	MICROCHIP	获取价格	PIC17FR44-25/P
PIC17FR44-25/PQ	MICROCHIP	获取价格	PIC17FR44-25/PQ

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