参数资料
型号: SST89C58RC-40-C-QIF-T
厂商: Microchip Technology
文件页数: 69/88页
文件大小: 0K
描述: IC MCU 8BIT FLASH 40WQFN
标准包装: 3,000
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: 带卷 (TR)
2011 Silicon Storage Technology, Inc.
DS25100A
12/11
71
FlashFlex MCU
SST89C58RC
Data Sheet
A Microchip Technology Company
System Clock and Clock Options
Clock Input Options and Recommended Capacitor Values for Oscillator
Shown in Figure 26 are the input and output of an internal inverting amplifier (XTAL1, XTAL2), which
can be configured for use as an on-chip oscillator.
When driving the device from an external clock source, XTAL2 should be left disconnected and XTAL1
should be driven.
At start-up, the external oscillator may encounter a higher capacitive load at XTAL1 due to interaction
between the amplifier and its feedback capacitance. However, the capacitance will not exceed 15 pF
once the external signal meets the VIL and VIH specifications.
Crystal manufacturer, supply voltage, and other factors may cause circuit performance to differ from
one application to another. C1 and C2 should be adjusted appropriately for each design. Table 27,
shows the typical values for C1 and C2 vs. crystal type for various frequencies
More specific information about on-chip oscillator design can be found in the FlashFlex Oscillator
Circuit Design Considerations application note.
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 28 for detail.
Clock double mode can be enabled either via the external host mode or the IAP mode. Please refer to
Table 12 for the IAP mode enabling command (When cleared, the Enable-Clock-Double bit in the
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.
Table 27:Recommended Values for C1 and C2 by Crystal Type
Crystal
C1 = C2
Quartz
20-30pF
Ceramic
40-50pF
T0-0.1 25100
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