So, like the topic name says, I picked up a tube of 8051 microcontrollers at a thrift shop for cheap. I've only ever worked with Arduinos so I'm not quite sure how to proceed. I now have 1 AT89C51RC and three P89C51RD2HBP's and no idea what to do with them. I read the data sheet and I see that I can program them via their serial ports, but is there an Arduino IDE equivalent for them? More to the point, how do I even hook them up? Do they need an external crystal? Can I re-purpose and Arduino UNO board (without the arduino chip) to communicate with them?
is there an Arduino IDE equivalent for them?
not that I know of. There is a C compiler (SDCC) but it doesn't have a very good reputation. There are also commercial C compilers. But 8051s are most often programmed in assembler. (there is also 8052 BASIC, but I don't know if there is a version for these particular chips, and it usually needs external RAM.)
More to the point, how do I even hook them up? Do they need an external crystal?
Yes. Of somewhat unusual frequency, to get the serial bootloader to work.
Can I re-purpose and Arduino UNO board (without the arduino chip) to communicate with them?
yes, probably.
Try looking at http://www.8052.com/ for a start.
Also, PJRC (of Teensy fame) used to do 8051 stuff and still has some resources on their page.
Don't know if this will help, but after badmouthing the 8051 I decided to do a small project with one. This is a AT89C2051-24PU which should be very similar to the AT89C51RC. (the AT89C51RC appears to be the better chip)
The programming tool I used is detailed at MCU 8051 IDE - Wikipedia and works well. The AT89C51RC is listed as being compatible with this compiler. I got a few of these chips from a cheap eBay dealer for slightly less than Digikey and got it to work after a very small bit of research. The basic process is write your code, compile it in the 8051 MCU IDE that I linked above, use just about any (e)(e)PROM programmer like my ChipMax 2 (and there are many cheap ones that would work fine) to send up the resulting .HEX file, and use the chip. There is no debugger or ICE for this, you have to move the chip to the programmer and back, but it's quite easy. Here is the project and my code. It's simply doing an inverted Night Rider LED animation for the time being.
; Program initialization
; --------------------
org 0h
sjmp start
delay: MOV R2, #200
outer: MOV R3, #250
inner: NOP
NOP
DJNZ R3, inner
DJNZ R2, outer
RET
; Program start
; --------------------
start:
MOV P3, 0 ; enable LEDs 0-5
CLR P1.2 ; enable LED 6
CLR P1.3 ; enable LED 7
loop: SETB P3.4 ; disable LED 4
LCALL delay
CLR P3.4 ; enable LED 4
SETB P3.5 ; disable LED 5
SETB P3.3 ; disable LED 3
LCALL delay
CLR P3.5 ; enable LED 5
CLR P3.3 ; enable LED 3
SETB P3.7 ; disable LED 6
SETB P3.2 ; disable LED 2
LCALL delay
CLR P3.7 ; enable LED 5
CLR P3.2 ; enable LED 4
SETB P1.2 ; disable LED 7
SETB P3.1 ; disable LED 1
LCALL delay
CLR P1.2 ; enable LED 7
CLR P3.1 ; enable LED 1
SETB P1.3 ; disable LED 8
SETB P3.0 ; disable LED 0
LCALL delay
CLR P1.3 ; enable LED 8
CLR P3.0 ; enable LED 0
; circle back
SETB P1.2 ; disable LED 7
SETB P3.1 ; disable LED 1
LCALL delay
CLR P1.2 ; enable LED 7
CLR P3.1 ; enable LED 1
SETB P3.7 ; disable LED 6
SETB P3.2 ; disable LED 2
LCALL delay
CLR P3.7 ; enable LED 6
CLR P3.2 ; enable LED 2
SETB P3.5 ; disable LED 5
SETB P3.3 ; disable LED 3
LCALL delay
CLR P3.5 ; enable LED 5
CLR P3.3 ; enable LED 3
sjmp loop
END
[/quote]
Sonicdh:
So, like the topic name says, I picked up a tube of 8051 microcontrollers at a thrift shop for cheap. I've only ever worked with Arduinos so I'm not quite sure how to proceed.
Use them to decorate your room? Make a nice collage with chips+resistors...?
Sonicdh:
So, like the topic name says, I picked up a tube of 8051 microcontrollers at a thrift shop for cheap. I've only ever worked with Arduinos so I'm not quite sure how to proceed. I now have 1 AT89C51RC and three P89C51RD2HBP's and no idea what to do with them. I read the data sheet and I see that I can program them via their serial ports, but is there an Arduino IDE equivalent for them? More to the point, how do I even hook them up? Do they need an external crystal? Can I re-purpose and Arduino UNO board (without the arduino chip) to communicate with them?
I started working on a Arduino compatible 8051 board and IDE. The IDE was based on Pinguino, I was able to get basic digitalWrite then paused the development. GitHub - codelectron/Neo51-IDE: Neo51-IDE is an 8051 IDE ported from pinguino which adapts the syntax of arduino.
Krishna