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T48C862M-R3 数据表(PDF) 26 Page - ATMEL Corporation

部件名 T48C862M-R3
功能描述  Microcontroller with UHF ASK/FSK Transmitter
PDF  107 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

T48C862M-R3 数据表(HTML) 26 Page - ATMEL Corporation

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T48C862-R3
4554A–4BMCU–02/03
Figure 21. RC-oscillator 1
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
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
±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).
RC
oscillator 1
RcOut1
Stop
Control
RcOut1
Osc-Stop
OS1
OS0
CCS
Supervisor Reset Output (Res)
110
Enable
111
Disable
x
0
x
Disable
Ext. input clock
ExOut
Stop
Ext.
Clock
RcOut1
Osc-Stop
ExIn
CCS
Res
OSC1
OSC2
Clock monitor
Ext.
Clock
or



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