SST89E54RD2A View Datasheet(PDF) - Silicon Storage Technology

Part Name

Description

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SST89E54RD2A

FlashFlex MCU

Silicon Storage Technology 

FlashFlex MCU

SST89E54RD2A/RDA / SST89E58RD2A/RDA

SST89V54RD2A/RDA / SST89V58RD2A/RDA

Data Sheet

read and write signals (P3.6 - WR# and P3.7 - RD#) for

external memory use. Table 3-3 shows external data mem-

ory RD#, WR# operation with EXTRAM bit.

The stack pointer (SP) can be located anywhere within the

256 bytes of internal RAM (lower 128 bytes and upper 128

bytes). The stack pointer may not be located in any part of

the expanded RAM.

TABLE 3-3: External Data Memory RD#, WR# with EXTRAM bit

MOVX @DPTR, A or MOVX A, @DPTR

AUXR

EXTRAM = 0

EXTRAM = 1

ADDR < 0300H

RD# / WR# not asserted

RD# / WR# asserted

ADDR >= 0300H

RD# / WR# asserted

RD# / WR# asserted

1. Access limited to ERAM address within 0 to 0FFH; cannot access 100H to 02FFH.

MOVX @Ri, A or MOVX A, @Ri

ADDR = Any

RD# / WR# not asserted1

RD# / WR# asserted

T3-3.0 1339

©2007 Silicon Storage Technology, Inc.

16

S71339-01-000

1/07

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