Flash Memory Emulation In Ram; Figure 18.3 Reading Overlap Ram Data In User Mode/User Program Mode - Hitachi H8/3062 Hardware Manual

Single-chip microcomputer h8/3062 series; h8/3062b series; h8/3062f-ztat series; h8/3064f-ztat series

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Flash Memory Emulation in RAM

In the H8/3064F-ZTAT B-mask version, flash memory programming can be emulated in real time

by overlapping the flash memory with part of RAM ("overlap RAM"). When the emulation block

set in RAMCR is accessed while the emulation function is being executed, data written in the

overlap RAM is read.

Emulation should be performed in user mode or user program mode.

Flash memory

Emulation block

(Emulation is performed on data written

Application program

Execution state

When overlap RAM data is confirmed, clear the RAMS bit to cancel RAM overlap, and actually

perform writes to the flash memory in user program mode.

When the programming control program is transferred to RAM in on-board programming mode,

ensure that the transfer destination and the overlap RAM do not overlap, as this will cause data in

the overlap RAM to be rewritten.