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The table below compares the PIC and related microcontrollers
that I think are interesting for hobbyists and low-volume professionals.
| chip |
package |
I/O |
code |
data |
eeprom |
peripherals |
MIPS |
$ |
tools |
remarks |
| 12c508 |
sdip 8 |
6 |
0.5k |
25 |
- |
osc |
1 |
1.40 |
Jal |
not flash |
| 12c509 |
sdip 8 |
6 |
1k |
41 |
- |
osc |
1 |
1.50 |
Jal |
not flash |
| 16c84 |
sdip 18 |
13 |
1k |
38 |
64 |
- |
2.5 |
- |
Jal, Wisp |
obsolete |
| 16f84 |
sdip 18 |
13 |
1k |
68 |
64 |
- |
2.5 |
- |
Jal, Wisp |
obsolete |
| 16f84a |
sdip 18 |
13 |
1k |
68 |
64 |
- |
5 |
4.70 |
Jal, Wisp |
|
| 16f627 |
sdip 18 |
16 |
1k |
224 |
128 |
d/a, uart, osc |
5 |
? |
Jal, Wisp |
|
| 16f628 |
sdip 18 |
16 |
2k |
224 |
128 |
d/a, uart, osc |
5 |
3.25 |
Jal, Wisp |
2nd choice |
| 16f870 |
sdip 28 |
22 |
2k |
128 |
64 |
a/d, uart |
5 |
3.95 |
Jal, Wisp, WLoader |
|
| 16f871 |
wdip 40 |
33 |
2k |
128 |
64 |
a/d, uart |
5 |
4.95 |
Jal, Wisp, WLoader |
|
| 16f872 |
sdip 28 |
22 |
2k |
128 |
64 |
a/d, mssp |
5 |
3.50 |
Jal, Wisp, WLoader |
|
| 16f873 |
sdip 28 |
22 |
4k |
192 |
128 |
a/d, uart |
5 |
7.00 |
Wisp, WLoader |
|
| 16f874 |
wdip 40 |
33 |
4k |
192 |
128 |
a/d, uart |
5 |
7.50 |
Wisp, WLoader |
|
| 16f876 |
sdip 28 |
22 |
8k |
368 |
256 |
a/d, mssp |
5 |
8.50 |
Jal, Wisp, WLoader |
|
| 16f877 |
wdip 40 |
33 |
8k |
368 |
256 |
a/d, mssp |
5 |
8.50 |
Jal, Wisp, WLoader |
1st choice |
| SX18 |
sdip 20 |
12 |
2k |
136 |
- |
osc |
50 |
4 |
Jal |
|
| SX28 |
sdip 28 |
20 |
2k |
136 |
- |
osc |
50 |
4.40 |
Jal |
|
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The prices are for single chips, commercial grade, DIP package,
and are of course just indications.
High-volume buyers should be able to get much better prices.
The best choice for making a start
is definitely the 16f877, followed by the (cheaper but less capable) 16f628.
The 16f84a is only interesting to replace the 16f84 or 16c84 in old designs,
and the SX28 is the choice when a lot of MIPS is needed.
The 12c508 and 12c509 are interesting for larger series, but these
chips are eeprom (not flash), so development is more difficult
and requires (expensive) windowed chips and an eeprom eraser.
The 16f873 and 16f874 are interesting only as replacement for older (OTP) chips.
The other 16f87x chips can be used as cheaper and/or smaller replacements
for the 16f877 when you don not need its full power.
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