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AT89C51ED2-RDTIM Arkusz danych(PDF) 18 Page - ATMEL Corporation

Numer części AT89C51ED2-RDTIM
Szczegółowy opis  8-bit Flash Microcontroller
PDF  137 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM Arkusz danych(HTML) 18 Page - ATMEL Corporation

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AT89C51RD2/ED2
4235E–8051–04/04
Figure 6. Mode Switching Waveforms
The X2 bit in the CKCON0 register (see Table 16) 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
16) and SPIX2 bit in the CKCON1 register (see Table 17) allows a switch from standard
peripheral speed (12 clock periods per peripheral clock cycle) to fast peripheral 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
STD Mode
STD Mode
FOSC



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