MC68HC08AS32 Datasheet, PDF (139/394 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

System Integration Module (SIM)
Low-Power Modes
ideal for applications using canned oscillators that do not require long
startup times from stop mode.
NOTE: External crystal applications should use the full stop recovery time by
clearing the SSREC bit.
A break interrupt during stop mode sets the SIM break stop/wait bit
(SBSW) in the SIM break status register (SBSR).
The SIM counter is held in reset from the execution of the STOP
instruction until the beginning of stop recovery. It is then used to time the
recovery period. Figure 9-14 shows stop mode entry timing.
CPUSTOP
IAB
STOP ADDR
STOP ADDR + 1
SAME
SAME
IDB
PREVIOUS DATA
NEXT OPCODE
SAME
SAME
R/W
NOTE: Previous data can be operand data or the STOP opcode, depending on the last instruction.
Figure 9-14. Stop Mode Entry Timing
CGMXCLK
INT/BREAK
IAB
STOP RECOVERY PERIOD
STOP +1
STOP + 2 STOP + 2
SP
SP – 1
SP – 2
SP – 3
Figure 9-15. Stop Mode Recovery from Interrupt or Break
MC68HC08AS32 — Rev. 3.0
MOTOROLA
System Integration Module (SIM)
Advance Information
139