Datasheet 搜索 > 微控制器 > Microchip（微芯） > PIC16C54C-04/P 数据手册 > PIC16C54C-04/P 用户编程技术手册 3/14 页
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PIC16C54C-04/P 用户编程技术手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
PDIP-18
描述:
MICROCHIP PIC16C54C-04/P 微控制器, 8位, 一次性可编程, PIC16C5xx, 4 MHz, 768 Byte, 25 Byte, 18 引脚, DIP
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PIC16C54C-04/P数据手册
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1996 Microchip Technology Inc. DS30190F-page 3
EPROM/ROM Memory Programming/Verify Specification
1.4 Pr
ogramming Method
The programming technique is described in the follow-
ing section. It is designed to guarantee good program-
ming margins. It does, however, require a variable
power supply for V
CC
.
1.4.1 PROGRAMMING METHOD DETAILS
Essentially, this technique includes the following steps:
1. Perform blank check at V
DD
= V
DD
min. Report
failure. The device may not be properly erased.
2. Program location with pulses and verify after
each pulse at V
DD
= V
DDP
:
where V
DDP
= V
DD
range required during pro-
gramming (4.5V - 5.5V).
a) Programming condition:
V
PP
= 13.0V to 13.25V
V
DD
= V
DDP
= 4.5V to 5.5V
V
PP
must be
≥
V
DD
+ 7.25V to keep “programming
mode” active.
b) Verify condition:
V
DD
= V
DDP
V
PP
≥
V
DD
+ 7.5V but not to exceed 13.25V
If location fails to program after “N” pulses, (sug-
gested maximum program pulses of 25) then
report error as a programming failure.
3. Once location passes “Step 2", apply 3X over-
programming, i.e., apply three times the number
of pulses that were required to program the loca-
tion. This will guarantee a solid programming
margin. The overprogramming should be made
“software programmable” for easy updates.
4. Program all locations.
5. Verify all locations (using speed verify mode) at
V
DD
= V
DD
min
6. Verify all locations at V
DD
= V
DD
max
V
DD
min is the minimum operating voltage spec. for
the part. V
DD
max is the maximum operating volt-
age spec. for the part.
Note:
Device must be verified at minimum and
maximum specified operating voltages as
specified in the data sheet.
1.4.2 SYSTEM REQUIREMENTS
Clearly, to implement this technique, the most stringent
requirements will be that of the power supplies:
V
PP
:
V
PP
can be a fixed 13.0V to 13.25V supply. It
must not exceed 14.0V to avoid damage to the pin and
should be current limited to approximately 100mA.
V
DD
:
2.0V to 6.5V with 0.25V granularity. Since this
method calls for verification at different V
DD
values, a
programmable V
DD
power supply is needed.
Current Requirement
: 40mA maximum
Microchip may release PIC16C5Xs in the future with
different V
DD
ranges which make it necessary to have
a programmable V
DD
.
It is important to verify an EPROM at the voltages
specified in this method to remain consistent with
Microchip's test screening. For example, a PIC16C5X
specified for 4.5V to 5.5V should be tested for proper
programming from 4.5V to 5.5V.
1.4.3 SOFTWARE REQUIREMENTS
Certain parameters should be programmable (and
therefore easily modified) for easy upgrade.
a) Pulse width
b) Maximum number of pulses, current limit 25.
c) Number of over-programming pulses: should be
= (A • N) + B, where N = number of pulses
required in regular programming. In our current
algorithm A = 3, B = 0.
1.5 Pr
ogramming Pulse Width
Program Memory Cells
: When programming one
word of EPROM, a programming pulse width (T
PW
) of
100
µ
s is recommended.
The maximum number of programming attempts
should be limited to 25 per word.
After the first successful verify, the same location
should be over-programmed with 3X over-program-
ming.
Configuration Word
: The configuration word for oscil-
lator selection, WDT (watchdog timer) disable and code
protection, requires a programming pulse width (T
PWF
)
of 10ms. A series of 100
µ
s pulses is preferred over a
single 10ms pulse.
Note:
Any programmer not meeting the program-
mable V
DD
requirement and the verify at
V
DD
max and V
DD
min requirement may
only be classified as “prototype” or “devel-
opment” programmer but not a production
programmer.
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