PXD10RM Datasheet, PDF (1085/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

(cnten & clksel== 2’b11)
4-16 MHz FXOSC
en
C.G.
CELL
(cnten & clksel== 2’b10)
16 MHz FIRC
en
C.G.
CELL
(cnten & clksel== 2’b01)
128 kHz SIRC
en
C.G.
CELL
(cnten & clksel== 2’b00)
32 kHz SXOSC
en
C.G.
CELL
0
0
C.G. div 512 ¹
CELL
en
C.G. div 32 ¹
CELL
en
div512en
div32en
32-bit counter
Figure 31-2. Clock gating for RTC clocks
31.3 Device specific information
For this device:
• FXOSC, SXOSC, FIRC and SIRC clocks are provided as counter clocks for the RTC. Default
clock on reset is SIRC divided by 4.
• The RTC will be reset on destructive reset, with the exception of software watchdog reset.
• The RTC provides a configurable divider by 512 to be optionally used when FXOSC source is
selected.
31.4 Modes of operation
There are two functional modes of operation for the RTC: normal operation and low power mode. In
normal operation, all RTC registers can read or written and the input isolation is disabled. The RTC/API
and associated interrupts are optionally enabled. In low power mode, the bus interface is disabled and the
input isolation is enabled. The RTC/API is enabled if enabled prior to entry into low power mode.
Freescale Semiconductor
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
31-3