ATAM510X-ILQY ATMEL [ATMEL Corporation], ATAM510X-ILQY Datasheet - Page 18

• Manufacturer Part Number: ATAM510X-ILQY
• Description: MARC4 4-bit MTP Universal Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

2.7.2.5
2.7.2.6
18
ATAM510
32-kHz Oscillator
Quartz Oscillator Configuration
Figure 2-13. System Clock Oscillator
Some applications require accurate long-term time keeping without putting excessive demands
on the CPU or alternatively low resolution computing power. In this case, the on-chip ultra low
power 32-kHz crystal oscillator can be used to generate both the SUBCL and/or the SYSCL. In
this mode, power consumption can be significantly reduced. The 32-kHz crystal oscillator will
key operating (not stopped) during any CPU power-down/SLEEP mode.
Figure 2-14. 32-kHz Crystal Oscillator
Note:
If the customer’s application necessitates the use of a quartz crystal clock source and this
requires capacitive trimming, the trimming capacitors are not integrated into the MTP unlike the
ATAR510 and should therefore be connected externally as discrete components between the
respective Quartz Crystal terminals (OSCIN, OSCOUT) and VSS.
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.
XTAL
OSCOUT
C
C
3
4
OSCIN
32 kHz
XTAL
OSCOUT
OSCIN
Cer.
Res
Oscin
Oscout
oscillator
32-kHz
Oscin
Oscout
oscillator
4-MHz
32Out
4Out
Stop
Osc-Stop
32Out
4Out
4711B–4BMCU–01/05