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AT87C5103-IBSIL 数据表(PDF) 5 Page - ATMEL Corporation

部件名 AT87C5103-IBSIL
功能描述  Low-pin Count 8-bit Microcontroller
Download  64 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT87C5103-IBSIL 数据表(HTML) 5 Page - ATMEL Corporation

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5
4134B–8051–06/03
Clock
The Errata Sheet core needs only 6 clock periods per machine cycle. This feature,
called ”X2”, provides the following advantages:
Divides frequency crystals by 2 (cheaper crystals) while keeping the same CPU
power.
Saves power consumption while keeping the same CPU power (oscillator power
saving).
Saves power consumption by dividing dynamic operating frequency by 2 in
operating and idle modes.
Increases CPU power by 2 while keeping the same crystal frequency.
In order to keep the original C51 compatibility, a divider-by-2 is inserted between the
XTAL1 signal and the main clock input of the core (phase generator). This divider may
be disabled by the software.
Description
The clock for the whole circuit and peripheral is first divided by 2 before being used by
the CPU core and peripherals. This allows any cyclic ratio to be accepted on the XTAL1
input. In X2 Mode, as this divider is bypassed, the signals on XTAL1 must have a cyclic
ratio between 40 to 60%. Figure 1. shows the clock generation block diagram. The X2
bit is validated on the XTAL1
÷ 2 rising edge to avoid glitches when switching from the
X2 to the STD mode. Figure 2 shows the mode switching waveforms.


类似零件编号 - AT87C5103-IBSIL

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