MC68HC908QY4A_10 Datasheet, PDF (194/200 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

A.2.3 Improved Auto Wakeup Module (AWU)
The QYxA contains an AWU that has improved accuracy across voltage and temperature for typical
testing.
• A new feature provides ability to run the AWU from an alternate source (internal oscillator or
external crystal). This is an advantage for an application that needs more accurate AWU operation.
• On the QYxA AWU approximate time out will be 16 ms for short time out and 512 ms for long time
out when running from the internal 32-kHz RC source.
• Finally, at lower voltages typical measurements have shown lower power consumption by the
QYxA AWU.
A.2.3.1 Registers Affected
Read:
Write:
Reset:
POR:
Bit 7
6
5
4
3
2
1
IRQPUD IRQEN
R
R
R
R OSCENINSTOP
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R
= Reserved
U = Unaffected
Figure A-5. Configuration Register 2 (CONFIG2)
Bit 0
RSTEN
U
0
Setting the OSCENINSTOP bit forces the AWU to use BUSCLKX2 as the source to this timeout.
A.2.4 New Power-on Reset Module (POR)
The QYxA POR re-arm voltage will have a minimum specification of 0.7 V while the QYx Classic POR
re-arm was 0.1 V. The higher POR re-arm voltage provides added protection against brown out
conditions.
MC68HC908QYA/QTA Family Data Sheet, Rev. 3
194
Freescale Semiconductor