AM1707_15 Datasheet, PDF (44/200 Pages) Texas Instruments – AM1707 ARM® Microprocessor

AM1707
SPRS637E – FEBRUARY 2010 – REVISED JUNE 2014
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6.4.2 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 and RTCK/GP7[14]. If an emulator is driving TCK into the
device during reset, then RTCK/GP7[14] will drive out RTCK. If TCK is not being driven into the device
during reset, then RTCK/GP7[14] will drive low. 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/GP7[14] 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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