Hi All,
I have exhausted the datasheet and am being ignored by Atmel currently so I figured I'd check on here if anyone had the information I need.
My problem is that I have an 89S52 microhttp://www.keil.com/dd/docs/datashts/atmel/at89s52_ds.pdf and I'm driving an LED(1 mA of current) on the P3.3 port pin. It's one of the interrupt pins but was the only one available for me to use in my design. When I do this the port pin p3.3 can only drive up to about 3V. Then when I disconnect the bias resistor it's able to drive to 5V just fine.
It says in the datasheet that port 3 is capable of sourcing/sinking current. Though, I couldn't find the max current it can supply. I think I may not be able to provide the correct current to the LED which is then bringing my voltage down to 3v but would like to know more about the 89S52 before I can say that for sure. Anyone know anything about port 3?
Thanks
-mike
I have exhausted the datasheet and am being ignored by Atmel currently so I figured I'd check on here if anyone had the information I need.
My problem is that I have an 89S52 microhttp://www.keil.com/dd/docs/datashts/atmel/at89s52_ds.pdf and I'm driving an LED(1 mA of current) on the P3.3 port pin. It's one of the interrupt pins but was the only one available for me to use in my design. When I do this the port pin p3.3 can only drive up to about 3V. Then when I disconnect the bias resistor it's able to drive to 5V just fine.
It says in the datasheet that port 3 is capable of sourcing/sinking current. Though, I couldn't find the max current it can supply. I think I may not be able to provide the correct current to the LED which is then bringing my voltage down to 3v but would like to know more about the 89S52 before I can say that for sure. Anyone know anything about port 3?
Thanks
-mike
AT89S52 Datasheet(PDF) 4 Page - ATMEL Corporation: Part No. AT89S52: Description 8-bit Microcontroller with 8K Bytes In-System Programmable Flash: Download 30 Pages.
Atmel At89s52 Pdf
- AT89S52 Datasheet(PDF) 2 Page - ATMEL Corporation: Part No. AT89S52: Description 8-bit Microcontroller with 8K Bytes In-System Programmable Flash: Download 30 Pages: Scroll/Zoom: 100%.
- The Atmel AT89 series is an Intel 8051-compatible family of 8 bit microcontrollers (μCs) manufactured by the Atmel Corporation. Based on the Intel 8051 core, the AT89 series remains very popular as general purpose microcontrollers, due to their industry standard instruction set, their low unit cost, and the availability of these chips in DIL (DIP) packages.
- A monolithic chip, the Atmel AT89S52 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications. The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a.
- Atmel’s high-density nonvolatile memory technology and is compatible with the indus-try-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory pro-grammer. By combining a versatile 8-bit CPU with in-system programmable Flash on a.