atam510 ATMEL Corporation, atam510 Datasheet - Page 17
atam510
Manufacturer Part Number
atam510
Description
Marc4 4-bit Mtp Universal Microcontroller
Manufacturer
ATMEL Corporation
Datasheet
1.ATAM510.pdf
(72 pages)
- Current page: 17 of 72
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2.7.2.2
2.7.2.3
2.7.2.4
4711B–4BMCU–01/05
4-MHz Oscillator
External Input Clock
RC-oscillator 2 with External Trimming Resistor
Figure 2-10. RC-oscillator 1
The SCLIN pin can be driven by an external clock source provided it meets the specified duty
cycle, rise and fall times and input levels. The maximum system clock frequency f
the core can operate is f
Figure 2-11. External Input Clock
The RC-oscillator 2 is a high stability oscillator whereby the oscillator frequency can be trimmed
with an external resistor between SCLIN and V
clock frequency does not exceed 2 MHz, the RC-oscillator 2 frequency can be maintained stable
with a tolerance of ±10% over the full operating temperature and voltage range.
For example: A SYSCL
150 kΩ (see
Figure 2-12. RC-oscillator 2
The integrated system clock oscillator requires an external crystal or ceramic resonator con-
nected between the OSCIN and OSCOUT pins to establish oscillation. All the necessary
oscillator circuitry, with the exception of the actual crystal, resonator and the optional C
are integrated on-chip.
Figure
2-12,
max
SCLIN
Figure 7-6 on page 65
Clock
frequency of 2 MHz, can be obtained by connecting a resistor R
Ext.
/2 (see
SCLIN
V
R
RC1
RC0
DD
SCLIN
ext
Figure
R
oscillator 1
oscillator 2
Ext. input clock
ExIn
Trim
2-11).
Control
RC-
RC-
RcOut1
RcOut2
DD
Stop
to
Stop
. In this configuration, as long as the system
ExOut
Figure 7-7 on page
Stop
Osc-Stop
Osc-Stop
RcOut1
RcOut2
Osc-Stop
ExOut
65).
ATAM510
SYSCLmax
3
and C
ext
that
17
=
4
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