3.2.4 Active BDM enabled in stop3 mode
Entry into the active background mode from run mode is enabled if the
BDC_SCR[ENBDM] bit is set. This register is described in the
BDC_SCR[ENBDM] is set when the CPU executes a STOP instruction, the system
clocks to the background debug logic remain active when the MCU enters stop mode, so
background debug communication is still possible. In addition, the voltage regulator does
not enter its low-power standby state but maintains full internal regulation.
Most background commands are not available in stop mode. The memory-access-with-
status commands do not allow memory access, but they report an error indicating that the
MCU is in either stop or wait mode. The BACKGROUND command can be used to
wake the MCU from stop and enter active background mode if the BDC_SCR[ENBDM]
bit is set. After entering background debug mode, all background commands are
available.
3.2.5 LVD enabled in stop mode
The LVD system is capable of generating either an interrupt or a reset when the supply
voltage drops below the LVD voltage. If the LVD is enabled in stop (LVDE and LVDSE
bits in SPMSC1 both set) at the time the CPU executes a STOP instruction, then the
voltage regulator remains active during stop3 mode.
3.2.6 Power modes behaviors
Executing the WAIT or STOP command puts the MCU in a low power consumption
mode for standby situations. The system integration module (SIM) holds the CPU in a
non-clocked state. The operation of each of these modes is described in the following
subsections. Both STOP and WAIT clear the interrupt mask (I) in the condition code
register, allowing interrupt to occur. The following table shows the low power mode
behaviors.
Table 3-1. Low power mode behavior
Mode
Run
Wait
Stop3
PMC
Full regulation
Full regulation
Loose regulation
ICS
On
On
Optional on
OSC
On
On
Optional on
LPO
On
On
On
CPU
On
Standby
Standby
FLASH
On
On
Standby
Table continues on the next page...
Chapter 3 Power management
MC9S08PT60 Reference Manual, Rev. 4, 08/2014
Freescale Semiconductor, Inc.
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