This document describes a feature unique to MicroConverters with an external data memory interface that allows addressing of up to 16MB of external data memory. This feature is fully compatible with the standard 8051 for addressing up to 64kBytes of external data memory.
The document describes a feature unique to the MicroConverter family that allows addressing up to 16MB of external data memory, exceeding the standard 8051 limit of 64KB. It details the hardware configuration required for this extended addressing capability.
To implement 24-bit addressing, users must add an additional latch to multiplex the data on Port 2, which outputs both high addresses (A8-A15) and page addresses (A16-A23). The note provides timing diagrams and instructions for read/write operations involving this external memory interface.
| Maximum external data memory addressable | 16MB |
|---|---|
| Standard 8051 external data memory limit | 64kBytes |
An additional latch is required to multiplex the data on Port 2, which outputs both high addresses and page addresses.
Yes, toggling of ALE can be disabled by setting PCON.4.