Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 39)

eZ8

™

CPU Core

User Manual

UM012820-0810 Address Space

Individual products containing the eZ8 CPU support varying amounts of

Program Memory. Refer to the Zilog Product Specification that is specific

to your Z8 Encore! device for your product to determine the amount of

Program Memory available. Attempts to read or execute from unavailable

Program Memory addresses return

FFh. Attempts to write to unavailable

Program Memory addresses produce no effect.

Data Memory

In addition to the Register File and the Program Memory, the eZ8 CPU

also accesses a maximum of 64 KB (65,536 bytes) of Data Memory. The

Data Memory space provides data storage only. Op Code and operand

fetches cannot be executed out of this space. Access is obtained by the use

of the LDE and LDEI instructions. Valid addresses for the Data Memory

are from

0000h to FFFFh.

Individual products containing the eZ8 CPU support varying amounts of

Data Memory. Refer to the Zilog Product Specification specific to your

Z8 Encore! device for your product to determine the amount of Data

Memory available. Attempts to read unavailable Data Memory addresses

returns

FFh. Attempts to write to unavailable Data Memory addresses

produce no effect.

0008–0027 Interrupt vector.

0028–FFFF Program code and data.

Table 7. Program Memory Map Example (Continued)

Program Memory

Address (Hex) Description

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 313 314

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Zilog Z8F0130 Manual do Utilizador Página 39