• Reads the start program counter (PC) from vector-table offset 4
• Link register (LR) is set to 0xFFFF_FFFF
The on-chip peripheral modules are disabled and the non-analog I/O pins are initially
configured as disabled. The pins with analog functions assigned to them are assigned by
default to their analog functions after reset.
During and following a reset, the JTAG pins have their associated input pins configured
as:
• TDI in pull-up (PU)
• TCK in pull-down (PD)
• TMS in PU
and associated output pin configured as:
• TDO with no pull-down or pull-up
NOTE
The nTRST signal is initially configured as disabled, however
once configured to its JTAG functionality, its associated input
pin is configured as:
• nTRST in PU
22.2.2.1 External pin reset (PIN)
On this device, asserting RESET wakes and resets the device from any mode. During a
pin reset, RCM_SRS[PIN] is set.
The RESET pin filter supports filtering from both the 1 kHz LPO clock and the bus
clock. RCM_RPC[RSTFLTSS], RCM_RPC[RSTFLTSRW], and
RCM_RPC[RSTFLTSEL] control this functionality; see the
asynchronously reset by Chip POR. The reset value for each filter assumes the RESET
pin is negated.
For all stop modes where LPO clock is still active, the only filtering option is the LPO-
based digital filter. The filtering logic either switches to bypass operation or has
continued filtering operation depending on the filtering mode selected.
The LPO filter has a fixed filter value of 3. Due to a synchronizer on the input data, there
is also some associated latency (2 cycles). As a result, 5 cycles are required to complete a
transition from low to high or high to low.
Chapter 22 Reset and Boot
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
553
Содержание KE1xF Series
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