AM1707_1008 Datasheet, PDF (44/199 Pages) Texas Instruments – ARM Microprocessor

AM1707
SPRS637A – FEBRUARY 2010 – REVISED APRIL 2010
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6.5.2 Warm Reset
A warm reset provides a limited reset to the device. Warm Reset is initiated by bringing only RESET low
(TRST is maintained high through a warm reset). Warm reset sets certain portions of the device to their
default state while leaving others unaltered. All pins are 3-stated with the exception of RESETOUT which
remains active through the reset sequence. RESETOUT is an output for use by other controllers in the
system that indicates the device is currently in reset.
During emulation, the emulator will maintain TRST high and hence only warm reset (not POR) is available
during emulation debug and development.
RTCK is maintained active through a warm reset.
A summary of the effects of Warm Reset is given below:
• All internal logic (except for the emulation logic and the PLL logic) is reset to its default state
• Internal memory is maintained through a warm reset
• RESETOUT goes active
• All device pins go to a high-impedance state
• The RTC peripheral is not reset during a warm reset. A software sequence is required to reset the
RTC.
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Peripheral Information and Electrical Specifications
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