s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 86

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

System Integration Module (SIM)
7.6.2 Stop Mode
In stop mode, the SIM counter is reset and the system clocks are disabled. An interrupt request from a
module can cause an exit from stop mode. Stacking for interrupts begins after the selected stop recovery
time has elapsed. Reset also causes an exit from stop mode.
The SIM disables the clock generator module outputs (CGMOUT and CGMXCLK) in stop mode, stopping
the CPU and peripherals. Stop recovery time is selectable using the SSREC bit in the configuration
register (CONFIG-1). If SSREC is set, stop recovery is reduced from the normal delay of 4096 CGMXCLK
cycles down to 32. This is ideal for applications using canned oscillators that do not require long startup
times from stop mode.
The break module is inactive in Stop mode. The STOP instruction does not affect break module register
states.
86
External crystal applications should use the full stop recovery time by
clearing the SSREC bit.
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
RST
IDB
IAB
$A6
WAIT ADDR
$A6
Figure 7-13. Wait Recovery from Interrupt or Break
Figure 7-14. Wait Recovery from Internal Reset
$6E0B
$A6
PREVIOUS DATA
$6E0B
$A6
Figure 7-12. Wait Mode Entry Timing
RST
MC68HC908AZ32A Data Sheet, Rev. 2
$A6
WAIT ADDR + 1
$A6
pin OR CPU interrupt OR break interrupt
$6E0C
Cycles
$01
32
NEXT OPCODE
NOTE
$00FF
$0B
Cycles
32
SAME
$00FE
$6E
SAME
$00FD
RST VCT H
SAME
$00FC
RST VCT L
SAME
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