S9S12G48F1CLC Datasheet, PDF (364/1292 Pages) Freescale Semiconductor, Inc – Microcontrollers

S12 Clock, Reset and Power Management Unit (S12CPMU)
10.1.2.3 Stop Mode
This mode is entered by executing the CPU STOP instruction.
The voltage regulator is in Reduced Power Mode (RPM).
The API is available.
The Phase Locked Loop (PLL) is off.
The Internal Reference Clock (IRC1M) is off.
Core Clock, Bus Clock and BDM Clock are stopped.
Depending on the setting of the PSTP and the OSCE bit, Stop Mode can be differentiated between Full
Stop Mode (PSTP = 0 or OSCE=0) and Pseudo Stop Mode (PSTP = 1 and OSCE=1). In addition, the
behavior of the COP in each mode will change based on the clocking method selected by
COPOSCSEL[1:0].
• Full Stop Mode (PSTP = 0 or OSCE=0)
External oscillator (XOSCLCP) is disabled.
— If COPOSCSEL1=0:
The COP and RTI counters halt during Full Stop Mode.
After wake-up from Full Stop Mode the Core Clock and Bus Clock are running on PLLCLK
(PLLSEL=1). COP and RTI are running on IRCCLK (COPOSCSEL0=0, RTIOSCSEL=0).
— If COPOSCSEL1=1:
During Full Stop Mode the COP is running on ACLK (trimmable internal RC-Oscillator clock)
and the RTI counter halts.
After wake-up from Full Stop Mode the Core Clock and Bus Clock are running on PLLCLK
(PLLSEL=1). The COP runs on ACLK and RTI is running on IRCCLK (COPOSCSEL0=0,
RTIOSCSEL=0).
• Pseudo Stop Mode (PSTP = 1 and OSCE=1)
External oscillator (XOSCLCP) continues to run.
— If COPOSCSEL1=0:
If the respective enable bits are set (PCE=1 and PRE=1) the COP and RTI will continue to run
with a clock derived from the oscillator clock.
The clock configuration bits PLLSEL, COPOSCSEL0, RTIOSCSEL are unchanged.
— If COPOSCSEL1=1:
If the respective enable bit for the RTI is set (PRE=1) the RTI will continue to run with a clock
derived from the oscillator clock.
The COP will continue to run on ACLK.
The clock configuration bits PLLSEL, COPOSCSEL0, RTIOSCSEL are unchanged.
NOTE
When starting up the external oscillator (either by programming OSCE bit
to 1 or on exit from Full Stop Mode with OSCE bit already 1) the software
must wait for a minimum time equivalent to the startup-time of the external
oscillator t_UPOSC before entering Pseudo Stop Mode.
MC9S12G Family Reference Manual, Rev.1.23
366
Freescale Semiconductor