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AT89C51RC2-3CSIM bảng dữ liệu(PDF) 17 Page - ATMEL Corporation

tên linh kiện AT89C51RC2-3CSIM
Giải thích chi tiết về linh kiện  Microcontroller with 16K/32K Bytes Flash
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT89C51RC2-3CSIM bảng dữ liệu(HTML) 17 Page - ATMEL Corporation

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AT89C51RB2/RC2
4180C–8051–12/03
Figure 6. Mode Switching Waveforms
The X2 bit in the CKCON0 register (see Table 15) allows a switch from 12 clock periods
per instruction to 6 clock periods and vice versa. At reset, the speed is set according to
X2 bit of Hardware Security Byte (HSB). By default, Standard mode is active. Setting the
X2 bit activates the X2 feature (X2 mode).
The T0X2, T1X2, T2X2, UARTX2, PCAX2, and WDX2 bits in the CKCON0 register
(Table 15) and SPIX2 bit in the CKCON1 register (see Table 16) allow a switch from
standard peripheral speed (12 clock periods per peripheral clock cycle) to fast periph-
eral speed (6 clock periods per peripheral clock cycle). These bits are active only in X2
mode.
XTAL1:2
XTAL1
CPU Clock
X2 Bit
X2 Mode
x1 Mode
X1 Mode
FOSC



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