openecu.org

Posted: **Wed Feb 01, 2006 9:39 am**

It seems like a losing battle to find a datasheet for the MH7202F.

I've got conflicting opinions from people on the similarity of these 2 chips. I spoke to someone today who has probed the
basic communication interface between the MUT II and a MH7202F and verified the basic pin outs appear to be the same.

Has anyone compared the H8/539F chip to the one fitted in the later Evo's?

Posted: **Wed Feb 01, 2006 9:42 am**

Just get a look here and you will be sure that this is the main chip

http://kaele.com/~kashima/car/evo/

Posted: **Wed Feb 01, 2006 11:49 am**

Here's what I know about the EVO ECU's I have seen

EVO 7: SH7052
EVO 8: SH7052
EVO 9: SH7055

EVO 8 ACD: MH7203FA

Posted: **Wed Feb 01, 2006 12:34 pm**

Thanks for that, so assuming our Japanese friend to be correct we have...
ISP Ver.2 Dir. F-ZTAT MPU
Pin # SIGNAL SIGNAL Pin #
1 GND → GND 1
2 GND →
3 RxD ← TxD 2
4 TxD → RxD 3
5 RESET → RESET 4
6 VCC ← +5V 5
7 VPP → VPP 6
8 MD2 → MD2 7
9 GND → GND 8
10 GND →

Posted: **Thu Feb 02, 2006 12:43 am**

cboles wrote:Here's what I know about the EVO ECU's I have seen

EVO 7: SH7052
EVO 8: SH7052
EVO 9: SH7055

EVO 8 ACD: MH7203FA

What is ACD Colby ?

Posted: **Thu Feb 02, 2006 1:51 am**

Active Centre Diff?

Posted: **Thu Feb 02, 2006 10:27 am**

Yes. I'm referring to the seperate controller for the active center diff.

openecu.org

MH7202F - H8/539F

MH7202F - H8/539F