mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 397

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

While the MCU is in wait mode, there are some restrictions on which background debug
commands can be used. Only the BACKGROUND command and memory-access-with-
status commands are available when the MCU is in wait 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 wait mode and enter
active background mode. After entering halt mode, all background commands are
available.
17.4.5 Stop Modes
This device contains a variety of stop modes to meet your application needs. The stop
modes range from:
to:
The choice of stop mode depends upon the user's application, where power usage and
state retention versus functional needs are traded off.
The various stop modes are selected by setting the appropriate bits in the power mode
protection (PMPROT) and power mode control (PMCTRL) registers. The selected mode
is entered following the execution of a STOP instruction.
The available stop modes are:
Freescale Semiconductor, Inc.
• a stopped CPU, with all I/O, logic and memory states retained, certain asynchronous
• a powered down CPU, with only I/O and a small register file retained, very few
• Normal stop (STOP)
• Very low power stop (VLPS)
• Low leakage stop (LLS)
• Very low leakage stop 3 (VLLS3)
• Very low leakage stop 2 (VLLS2)
• Very low leakage stop 1 (VLLS1)
mode peripherals operating
asynchronous mode peripherals operating, while the remainder of the MCU is
powered down
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
Chapter 17 System Mode Controller (SMC)
397