Programming Atmel AT89C51ED2 using ISP
Posted: 06 Dec 2020 01:47
We are attempting to program the Atmel device AT89C51ED2 using the ISP method.
The programmer is Dataman 48Pro2C.
The device selected is Atmel AT89C51ED2-xm (ISP).
My questions are:
1. It's not clear to me what the Hardware Security Byte (HSB) check boxes indicate in the attached screen shot. When checked are they SET (1) (unprogrammed) or CLEARED (0) (programmed) for the X2 and Boot Loader Jump Bit (BLJB) check boxes?
2. Why are the HSB XRAM and "User Memory Lock Bits" grayed out as shown in same screen shot? This is not the case in parallel/ZIF mode where they are not grayed out.
3. Why are the following MCU pins used in the ISP connector, see (2) screen shots attached, they seem redundant?
PSEN, EA/VPP and ALE/PROG
Our ISP adapter board does not have these pins connected. Our circuit board has MCU pins
PSEN, EA/VPP and ALE/PROG pulled HIGH. The ISP process seems to work and gives a success
message but our user app program never runs afterwards. The Atmel datasheet (could not attach)
does not mention that these MCU pins are needed in ISP.
4. Why does your forum not allow a PDF to be attached?
Michael
The programmer is Dataman 48Pro2C.
The device selected is Atmel AT89C51ED2-xm (ISP).
My questions are:
1. It's not clear to me what the Hardware Security Byte (HSB) check boxes indicate in the attached screen shot. When checked are they SET (1) (unprogrammed) or CLEARED (0) (programmed) for the X2 and Boot Loader Jump Bit (BLJB) check boxes?
2. Why are the HSB XRAM and "User Memory Lock Bits" grayed out as shown in same screen shot? This is not the case in parallel/ZIF mode where they are not grayed out.
3. Why are the following MCU pins used in the ISP connector, see (2) screen shots attached, they seem redundant?
PSEN, EA/VPP and ALE/PROG
Our ISP adapter board does not have these pins connected. Our circuit board has MCU pins
PSEN, EA/VPP and ALE/PROG pulled HIGH. The ISP process seems to work and gives a success
message but our user app program never runs afterwards. The Atmel datasheet (could not attach)
does not mention that these MCU pins are needed in ISP.
4. Why does your forum not allow a PDF to be attached?
Michael