MC68332
REGISTER SUMMARY
USER’S MANUAL
D-7
RSTEN — Reset Enable
0 = Loss of reference causes the MCU to operate in limp mode.
1 = Loss of reference causes system reset.
STSIM — Stop Mode System Integration Clock
0 = SIM clock driven by an external source and VCO off during low-power stop.
1 = SIM clock driven by VCO during low-power stop.
STEXT — Stop Mode External Clock
0 = CLKOUT held low during low-power stop.
1 = CLKOUT driven from SIM clock during low-power stop.
D.2.4 RSR
— Reset Status Register
$YFFA07
RSR contains a status bit for each reset source in the MCU. RSR is updated when the
MCU comes out of reset. A set bit indicates what type of reset occurred. If multiple
sources assert reset signals at the same time, more than one bit in RSR may be set.
This register can be read at any time; a write has no effect.
EXT — External Reset
Reset caused by an external signal.
POW — Power-Up Reset
Reset caused by the power-up reset circuit.
SW — Software Watchdog Reset
Reset caused by the software watchdog circuit.
HLT — Halt Monitor Reset
Reset caused by the halt monitor.
LOC — Loss of Clock Reset
Reset caused by loss of clock frequency reference.
SYS — System Reset
Reset caused by a RESET instruction.
TST — Test Submodule Reset
Reset caused by the test submodule. Used during system test only.
D.2.5 SIMTRE
— System Integration Test Register (ECLK)
$YFFA08
Register is used for factory test only.
15
8
7
6
5
4
3
2
1
0
NOT USED
EXT
POW
SW
HLT
0
LOC
SYS
TST
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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