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PIC17CC44

更新时间： 2024-11-07 22:22:35
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美国微芯 - MICROCHIP 存储可编程只读存储器电动程控只读存储器
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EPROM Memory Programming Specification

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PIC17CC44 数据手册

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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  
1
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/VPP  
VSS  
2
3
1.0  
PROGRAMMING THE PIC17CXX  
4
5
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.  
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
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 Name  
Pin Type  
Pin Description  
RA <0:4>  
TEST  
RA <0:4>  
TEST  
I
I
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  
I/O  
P
VDD  
P
Power Supply  
VSS  
VSS  
P
Ground  
Legend: I = Input, O = Output, P = Power  
1996 Microchip Technology Inc.  
DS30139I-page 1  
This document was created with FrameMaker 4 0 4  
1234567...16

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