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AT87C5103-ICSIL Datasheet(PDF) 7 Page - ATMEL Corporation

Part # AT87C5103-ICSIL
Description  Low-pin Count 8-bit Microcontroller
PDF  64 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT87C5103-ICSIL Datasheet(HTML) 7 Page - ATMEL Corporation

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AT8xC5103
4134C–8051–09/04
Figure 2. Mode Switching Waveforms
The X2 bit in the CKCON register (See Table 1) allows switching from 12 clock cycles
per instruction to 6 clock cycles and vice versa. At reset, the standard speed is activated
(STD mode). Setting this bit activates the X2 feature (X2 Mode).
Note:
In order to prevent any incorrect operation while operating in the X2 Mode, users must be
aware that all peripherals using the clock frequency as a time reference (timers, PCA,
SPI) will have their time reference divided by 2. For example, a free running timer gener-
ating an interrupt every 20 ms will then generate an interrupt every 10 ms.
XTAL2
XTAL1
CPU Clock
X2 Bit
X2 Mode
STD Mode
STD Mode



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