Bosch-Cluster

Cluster Versions

There are dozens of different Clusters, some of which were manufactured by Motometer, and some by Bosch.

You can recognize the Bosch Cluster by its "grey" backplate, while the Motometer has a "black" backplate.

Bosch Cluster MCU

There are two main ICs used on the Bosch Cluster:

μPD70F3080 (Flash Memory)

μPD70F3081 (Mask Memory)

The μPD70F3081 cannot be reprogrammed by design as its using Masked ROM.

See https://en.wikipedia.org/wiki/Read-only_memory#Factory_programmed for details

The used MCU Subset is called V850/DB1 Avalon and is the first Generation of V850 MCUs.

Manual for the MCU can be found here:

https://www.renesas.com/br/en/document/mat/v850db1-32-16-bit-single-chip-microcontroller-avalon

Reprogramming Efforts

Until now its not yet clear how to reprogram the MCU, but there are some hints already

1. Someone needs to buy a PG-FP4 Programmer

2. Someone needs to connect it to the MCU according to the documentation

Community Programer

Developing a cost effective programer should be possible. According to documentation following are the technical specs to bring the MCU into bootloader:

1. Connect 5V to VDD0 Pin

2. Connect GND to VSS0 Pin

3. Connect TXD to RXD50 Pin (UART 5V Level)

4. Connect RXD to TXD50 Pin (UART 5V Level)

5. Connect GPIO-Pin(5v) to _RESET_

6. Connect GPIO-PIN(7.8V(sic)) to VPP Pin

7. Set _RESET_ pin to 5V

8. Set VPP pin to 7.8V

9. Pulse VPP-Pin 16 times

10. MCU should get into Bootmode

11. Develop try to use protocol which is descibed here https://github.com/gregjhogan/renesas-bootmode