参数资料
型号: SST89C58RC-40-C-QIF
厂商: Microchip Technology
文件页数: 3/88页
文件大小: 0K
描述: IC MCU 8BIT FLASH 40WQFN
标准包装: 81
系列: FlashFlex®
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: EBI/EMI,I²C,SMBus,UART/USART
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 32
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: 0°C ~ 70°C
封装/外壳: 40-WFQFN 裸露焊盘
包装: 管件
2011 Silicon Storage Technology, Inc.
DS25100A
12/11
11
FlashFlex MCU
SST89C58RC
Data Sheet
A Microchip Technology Company
DPTR points to 0A0H and data in “A” is written to address 0A0H of the expanded RAM rather than
external memory. Access to external memory higher than 2FFH using the MOVX instruction will
access external memory (0300H to FFFFH) and will perform in the same way as the standard 8051,
with P0 and P2 as data/address bus, and P3.6 and P3.7 as write and read timing signals.
When EXTRAM = 1, MOVX @Ri and MOVX @DPTR will be similar to the standard 8051. Using
MOVX @Ri provides an 8-bit address with multiplexed data on Port 0. Other output port pins can be
used to output higher order address bits. This provides external paging capabilities. Using MOVX
@DPTR generates a 16-bit address. This allows external addressing up the 64K. Port 2 provides the
high-order eight address bits (DPH), and Port 0 multiplexes the low order eight address bits (DPL) with
data. Both MOVX @Ri and MOVX @DPTR generates the necessary read and write signals (P3.6 -
WR# and P3.7 - RD#) for external memory use. Table 2 shows external data memory RD#, WR# oper-
ation 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 2: 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. 100H to 02FFH is not accessible.
EXTRAM = 1
RD# / WR# asserted
T0-0.0 25100
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