MC68HC908JL8 MOTOROLA [Motorola, Inc], MC68HC908JL8 Datasheet - Page 104

• Manufacturer Part Number: MC68HC908JL8
• Description: Motorola reserves the right to make changes without further notice to any products herein
• Manufacturer: MOTOROLA [Motorola, Inc]

System Integration Module (SIM)
7.7.2 Stop Mode
Technical Data
104
NOTE:
NOTE:
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.
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.
To minimize stop current, all pins configured as inputs should be driven
to a logic 1 or logic 0.
Freescale Semiconductor, Inc.
CPUSTOP
NOTE: Previous data can be operand data or the STOP opcode, depending on the last
For More Information On This Product,
R/W
IDB
IAB
instruction.
System Integration Module (SIM)
Go to: www.freescale.com
STOP ADDR
Figure 7-18. Stop Mode Entry Timing
Figure 7-18
PREVIOUS DATA
STOP ADDR + 1
shows stop mode entry timing.
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MC68HC908JL8
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Rev. 2.0