参数资料
型号: SST89E54RD2A-40-C-TQJE
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44
封装: ROHS COMPLIANT, MS-026ACB, TQFP-44
文件页数: 7/78页
文件大小: 1671K
代理商: SST89E54RD2A-40-C-TQJE
Data Sheet
FlashFlex MCU
SST89E54RD2A/RDA / SST89E58RD2A/RDA
15
2008 Silicon Storage Technology, Inc.
S71339-02-000
02/08
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
MOVX @Ri, A or MOVX A, @Ri
AUXR
ADDR < 0300H
ADDR >= 0300H
ADDR = Any
EXTRAM = 0
RD# / WR# not asserted
RD# / WR# asserted
RD# / WR# not asserted1
1. Access limited to ERAM address within 0 to 0FFH; cannot access 100H to 02FFH.
EXTRAM = 1
RD# / WR# asserted
T3-3.0 1339
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