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Bit
18
EXCKEN: External expansion clock enable. If this bit is set, the EXPCLK is enabled continuously
as a free running clock with the same frequency and phase as the CPU clock, assuming that the
main oscillator is running. This bit should not be left set all the time for power consumption rea-
sons. If the system enters the Standby State, the EXPCLK will become undefined. If this bit is
clear, EXPCLK will be active during memory cycles to expansion slots that have external wait
state generation enabled only.
19
WAKEDIS: Setting this bit disables waking up from the Standby State, via the wakeup input.
20
IRTXM: IrDA TX mode bit. This bit controls the IrDA encoding strategy. Clearing this bit means
that each zero bit transmitted is represented as a pulse of width 3/16th of the bit rate period. Set-
ting this bit means each zero bit is represented as a pulse of width 3/16th of the period of
115,200-bit rate clock (i.e., 1.6 µs regardless of the selected bit rate). Setting this bit will use less
power, but will probably reduce transmission distances.
76
Description
Table 35. SYSCON1 (cont.)
DS508UM1
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