MC908JL8CDWE Datasheet, PDF (74/212 Pages) Freescale Semiconductor, Inc – Microcontrollers

System Integration Module (SIM)
IAB
$6E0B
$6E0C $00FF $00FE $00FD $00FC
IDB $A6 $A6
$A6
$01
$0B
$6E
EXITSTOPWAIT
NOTE: EXITSTOPWAIT = RST pin OR CPU interrupt OR break interrupt
Figure 5-16. Wait Recovery from Interrupt or Break
IAB
$6E0B
32
Cycles
32
Cycles
RSTVCTH RSTVCTL
IDB $A6 $A6
$A6
RST
ICLK
Figure 5-17. Wait Recovery from Internal Reset
5.6.2 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 or break also causes an exit from stop mode.
The SIM disables the oscillator signals (OSCOUT) in stop mode, stopping the CPU and peripherals. Stop
recovery time is selectable using the SSREC bit in the configuration register 1 (CONFIG1). If SSREC is
set, stop recovery is reduced from the normal delay of 4096 ICLK cycles down to 32. This is ideal for
applications using canned oscillators that do not require long start-up 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 break status register
(BSR).
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 5-18 shows stop mode entry timing.
NOTE
To minimize stop current, all pins configured as inputs should be driven to
a logic 1 or logic 0.
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
74
Freescale Semiconductor