mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 133

• Manufacturer Part Number: mc68hc908qf4
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

14.7.2 Stop Mode
MC68HC908QF4 — Rev. 1.0
MOTOROLA
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. In wait mode, the CPU clocks are
inactive. 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 in emulation mode). A break
interrupt during wait mode sets the SIM break stop/wait bit, SBSW, in the break
status register (BSR). If the COP disable bit, COPD, in the configuration register
is 0, then the computer operating properly module (COP) is enabled and remains
active in wait mode.
Figure 14-16
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.
EXITSTOPWAIT
NOTE: EXITSTOPWAIT = RST pin OR CPU interrupt
ADDRESS BUS
ADDRESS BUS
1. RST is only available if the RSTEN bit in the CONFIG1 register is set.
BUSCLKX4
DATA BUS
DATA BUS
Freescale Semiconductor, Inc.
RST
For More Information On This Product,
(1)
and
Figure 14-17. Wait Recovery from Internal Reset
$A6
$A6
System Integration Module (SIM)
Go to: www.freescale.com
Figure 14-16. Wait Recovery from Interrupt
Figure 14-17
$6E0B
$A6
$6E0B
$A6
$A6
$A6
show the timing for wait recovery.
CYCLES
$6E0C
32
$01
$00FF
CYCLES
$0B
32
System Integration Module (SIM)
$00FE
$6E
RST VCT H
$00FD
Low-Power Modes
RST VCT L
$00FC
Data Sheet
133