ATAM893X-TKHYZ ATMEL [ATMEL Corporation], ATAM893X-TKHYZ Datasheet - Page 18

• Manufacturer Part Number: ATAM893X-TKHYZ
• Description: Flash Version for ATAR080, ATAR090/890 and ATAR092/892
• Manufacturer: ATMEL [ATMEL Corporation]

4.5.2.3
4.5.2.4
18
ATAM893-D
RC-oscillator 2 with External Trimming Resistor
4-MHz Oscillator
Table 4-5.
The RC-oscillator 2 is a high resolution trimmable oscillator whereby the oscillator frequency can
be trimmed with an external resistor between OSC1 and V
lator 2 frequency can be maintained stable with a tolerance of 15%/-20% over the full operating
temperature and a voltage range V
For example: An output frequency at the RC-oscillator 2 of 2 MHz can be obtained by connect-
ing a resistor R
Figure 4-15. RC-oscillator 2
The ATAM893-D 4-MHz oscillator options need a crystal or ceramic resonator connected to the
OSC1 and OSC2 pins to establish oscillation. All the necessary oscillator circuitry, with the
exception of the actual crystal, resonator, C
Figure 4-16. 4-MHz Crystal Oscillator
Note:
OS1
Both, the 4-MHz and the 32-kHz crystal oscillator, use an integrated 14 stage divider circuit to sta-
bilize oscillation before the oscillator output is used as system clock. This results in an additional
delay of about 4 ms for the 4-MHz crystal and about 500 ms for the 32-kHz crystal.
1
1
x
Supervisor Function Control Bits
ext
= 360 k (see
OS0
flash option
1
1
0
V
*
OSC1
OSC2
R
XTAL
4 MHz
DD
OSC1
OSC2
ext
Figure
DD
from 2.5 V to 6.0 V.
4-15).
*
*
C
C
RC-oscillator 2
1
2
R
CCS
Trim
3
Oscin
Oscout
0
1
x
and C
oscillator
4-MHz
RcOut2
Stop
4
4Out
Stop
are integrated on-chip.
DD
Supervisor Reset Output (Res)
. In this configuration, the RC-oscil-
Osc-Stop
RcOut2
Osc-Stop
4Out
Disable
Disable
Enable
4680C–4BMCU–01/05