
to configure the MCU at reset as shown in this table.
Table 23-2. FTFC_FOPT definition
Bit
numb
er
Field
Value
Definition
7-6
Reserved
Reserved for future expansion
5
Reserved
Reserved
4
Reserved
Reserved for future expansion
3
RESET_PIN_CFG
Enables/disables control for the RESET pin.
0
RESET_B pin is disabled following a POR and cannot be enabled as reset
function. When this option is selected, there could be a short period of contention
during a POR ramp where the MCU drives the pin low prior to establishing the
setting of this option and releasing the reset function on the pin.
This bit is preserved through system resets and low-power modes. When
RESET_B pin function is disabled, it cannot be used as a source for low-power
mode wake-up.
1
The port is configured with pullup enabled, passive filter enabled.
2
NMI_PIN_CFG
Enables/disables control for the NMI function.
0
NMI interrupts are always blocked. The associated pin continues to default to
NMI_b pin controls with internal pullup enabled. When NMI_b pin function is
disabled, it cannot be used as a source for low-power mode wake-up.
If the NMI function is not required, either for an interrupt or wake up source, it is
recommended that the NMI function be disabled by writing 0 to NMI_PIN_CFG.
1
NMI_b pin/interrupts reset default to enabled.
1
Reserved
Reserved for future expansion.
0
LPBOOT
Controls the reset value of clock divider of IRC 48 Mhz to feed the Core and platform
clocks. Larger divide value selections produce lower average power consumption during
POR and reset sequencing and after reset exit.
0
Core and system clock divider (OUTDIV1) is 0x1 (divide by 2).
1
Core and system clock divider (OUTDIV1) is 0x0 (divide by 1).
23.3.3 Boot sequence
At power up, the on-chip regulator holds the system in a POR state until the input supply
is above the POR threshold. The system continues to be held in this static state until the
internally regulated supplies have reached a safe operating voltage as determined by the
LVD. The mode controller reset logic then controls this sequence to exit reset:
1. A system reset is held on internal logic, the RESET_B pin is driven out low, and the
SCG is enabled in its default clocking mode.
2. Required clocks are enabled (core clock, system clock, flash clock, and any bus
clocks that do not have clock gate control reset to disabled).
Chapter 23 Reset and Boot
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
491
Содержание MWCT101 S Series
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