EPF011A 데이터 시트보기 (PDF) - Unspecified

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EPF011A

Generic MCU with 64K Embedded Flash

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User Guide — EPF011ACD_UG V0.2

2.5.3 Auxiliary Data RAM

The Auxiliary Data RAM is a read/write type data memory which is addressed by an 8-bit short address

from R0/R1 or by a 16-bit long address from DPTR. The lowest 256 bytes ($F800 ~ $F8FF) can be accessed

by either R0/R1 or DPTR. The rest can only be accessed by DPTR.

The highest 256 bytes ($FF00 ~ $FFFF) are reserved for special purpose in ICP mode. ICP loader should

not use these 256 bytes of Auxiliary Data RAM.

The Auxiliary Data RAM can be used to replace the highest 2K program space in Flash ($F800~$FFFF)

when the mem_mode bit (bit-6 in Clock Control Register - SFR $FF) is set. In this case the Auxiliary Data

RAM will serve as program memory as well as data memory.

In External Access mode, the Auxiliary Data RAM is inhibited if mem_mode bit is cleared (reset state) and

is enabled if mem_mode bit is set.

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