參數資料
型號: SST89V58RD2-33-I-TQJE
廠商: Microchip Technology
文件頁數: 72/92頁
文件大小: 0K
描述: IC MCU 8BIT 40KB FLASH 44TQFP
標準包裝: 160
系列: FlashFlex®
核心處理器: 8051
芯體尺寸: 8-位
速度: 33MHz
連通性: EBI/EMI,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,WDT
輸入/輸出數: 36
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 8K x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 托盤
2011 Silicon Storage Technology, Inc.
DS25087A
10/11
74
FlashFlex MCU
SST89V54RD2/RD / SST89V58RD2/RD
Not Recommended for New Designs
A Microchip Technology Company
Clock Doubling Option
By default, the device runs at 12 clocks per machine cycle (x1 mode). The device has a clock doubling
option to speed up to 6 clocks per machine cycle. Please refer to Table 29 for detail.
Clock double mode can be enabled either via the external host mode or the IAP mode. Please refer to
Table 13 for the IAP mode enabling commands (When set, the EDC# bit in SFST register will indicate
6 clock mode.).
The clock double mode is only for doubling the internal system clock and the internal flash
memory, i.e. EA#=1. To access the external memory and the peripheral devices, careful consideration
must be taken. Also note that the crystal output (XTAL2) will not be doubled.
Figure 33:Oscillator Characteristics
Table 29: Clock Doubling Features
Device
Standard Mode (x1)
Clock Double Mode (x2)
Clocks per
Machine
Cycle
Max. External Clock
Frequency
(MHz)
Clocks per
Machine
Cycle
Max. External Clock
Frequency
(MHz)
SST89V5xRD2/RD
12
33
6
16
T0-0.0 25087
1255 F32.0
XTAL2
XTAL1
VSS
C1
Using the On-Chip Oscillator
External Clock Drive
C2
XTAL2
XTAL1
VSS
External
Oscillator
Signal
NC
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