參數(shù)資料
型號(hào)： SST89E54RC-33-C-PIE
廠商： Microchip Technology
文件頁(yè)數(shù)： 49/71頁(yè)
文件大?。?/td> 0K
描述： IC MCU 8BIT 17KB FLASH 40PDIP
標(biāo)準(zhǔn)包裝： 9
系列： FlashFlex®
核心處理器： 8051
芯體尺寸： 8-位
速度： 33MHz
連通性： EBI/EMI，UART/USART
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 16KB（16K x 8）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 外部
工作溫度： 0°C ~ 70°C
封裝/外殼： 40-DIP（0.600"，15.24mm）
包裝： 管件
2011 Silicon Storage Technology, Inc.
DS25088A
10/11
53
FlashFlex MCU
SST89E52RC / SST89E54RC
Data Sheet
A Microchip Technology Company
System Clock and Clock Options
Clock Input Options and Recommended Capacitor Values for Oscillator
Shown in Figure 15 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 20,
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 Cir-
cuit 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 21 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 command (When set, the Enable-Clock-Double_i 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 20:Recommended Values for C1 and C2 by Crystal Type
Crystal
C1 = C2
Quartz
20-30pF
Ceramic
40-50pF
T0-0.1 25008
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