MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 122

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

System Integration Module (SIM)
9.6.1 Wait Mode
In wait mode, the CPU clocks are inactive while one set of peripheral clocks continue to run.
shows the timing for wait mode entry.
A module that is active during wait mode can wake up the CPU with an interrupt if the interrupt is enabled.
Stacking for the interrupt begins one cycle after the WAIT instruction during which the interrupt occurred.
Refer to the wait mode subsection of each module to see if the module is active or inactive in wait mode.
Some modules can be programmed to be active in wait mode.
Wait mode can also be exited by a reset or break. A break interrupt during wait mode sets the SIM break
wait bit, BW, in the SIM break status register (SBSR). If the COP disable bit, COPD, in the configuration
register is logic 0, then the computer operating properly module (COP) is enabled and remains active in
wait mode.
122
EXITSTOPWAIT
NOTE: EXITSTOPWAIT =
CGMXCLK
R/W
IDB
IAB
NOTE: Previous data can be operand data or the WAIT opcode, depending on the last instruction.
IDB
IAB
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
RST
IDB
IAB
$A6
WAIT ADDR
$A6
Figure 9-13. Wait Recovery from Interrupt or Break
Figure 9-14. Wait Recovery from Internal Reset
$6E0B
$A6
PREVIOUS DATA
$6E0B
$A6
Figure 9-12. Wait Mode Entry Timing
RST
$A6
WAIT ADDR + 1
$A6
pin OR CPU interrupt OR break interrupt
$6E0C
Cycles
$01
32
NEXT OPCODE
$00FF
$0B
Cycles
32
SAME
$00FE
$6E
SAME
$00FD
RST VCT H
SAME
$00FC
RST VCT L
SAME
Freescale Semiconductor
Figure 9-12