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T48C862-R8 Datasheet

  • T48C862-R8

  • MCU

  • Atmel   Atmel

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Figure 21.
RC-oscillator 1
RC
oscillator 1
RcOut1
Stop
RcOut1
Osc-Stop
Control
External Input Clock
The OSC1 or OSC2 (mask option) can be driven by an external clock source provided it
meets the specified duty cycle, rise and fall times and input levels. Additionally, the
external clock stage contains a supervisory circuit for the input clock. The supervisor
function is controlled via the OS1, OS0-bit in the SC-register and the CCS-bit in the CM-
register. If the external input clock is missing for more than 1 ms and CCS = 0 is set in
the CM-register, the supervisory circuit generates a hardware reset.
Figure 22.
External Input Clock
Ext. input clock
Ext.
Clock
or
Ext. OSC2
Clock
Clock monitor
OSC1
ExIn
Stop
ExOut
RcOut1
Osc-Stop
CCS
Res
OS1
1
1
x
OS0
1
1
0
CCS
0
1
x
Supervisor Reset Output (Res)
Enable
Disable
Disable
RC-oscillator 2 with External
Trimming Resistor
The RC-oscillator 2 is a high resolution trimmable oscillator whereby the oscillator fre-
quency can be trimmed with an external resistor between OSC1 and V
DD
. In this
configuration, the RC-oscillator 2 frequency can be maintained stable with a tolerance of
鹵10% over the full operating temperature and a voltage range V
DD
from 2.5 V to 6.0 V.
For example:
An output frequency at the RC-oscillator 2 of 2 MHz can be obtained by connecting a
resistor R
ext
= 360 kW (see Figure 23).
26
T48C862-R8
4590B鈥?BMCU鈥?2/03

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