AM1705DPTPA3 Datasheet, PDF (41/164 Pages) Texas Instruments – AM1705 ARM Microprocessor

AM1705
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SPRS657D – FEBRUARY 2010 – REVISED MARCH 2013
5.5.2 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 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.
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
• All device pins go to a high-impedance state
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Peripheral Information and Electrical Specifications
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