MK30DN512ZVLK10 Freescale Semiconductor, MK30DN512ZVLK10 Datasheet - Page 484

• Manufacturer Part Number: MK30DN512ZVLK10
• Description: ARM Microcontrollers - MCU KINETIS 512K SLCD
• Manufacturer: Freescale Semiconductor

Specifications of MK30DN512ZVLK10

• Core: ARM Cortex M4
• Processor Series: K30
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 512 KB
• Data Ram Size: 128 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 1.71 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: LQFP-80
• Mounting Style: SMD/SMT

Functional Description
22.4.2 The EWM_in Signal
The EWM_in is a digital input signal that allows an external circuit to control the
EWM_out signal. For example, in the application, an external circuit monitors a critical
safety function, and if there is fault with this circuit's behavior, it can then actively initiate
the EWM_out signal that controls the gating circuit.
The EWM_in signal is ignored if the EWM is disabled, or if INEN bit of CTRL register
is cleared, as after any reset.
On enabling the EWM (setting the CTRL[EWMEN] bit) and enabling EWM_in
functionality (setting the CTRL[INEN] bit), the EWM_in signal must be in the deasserted
state prior to the CPU servicing the EWM. This ensures that the EWM_out stays in the
deasserted state; otherwise, the EWM_out pin is asserted.
22.4.3 EWM Counter
It is an 8-bit ripple counter fed from a clock source that is independent of the peripheral
bus clock source. As the preferred time-out is between 1 ms and 100 ms the actual clock
source should be in the kHz range.
The counter is reset to zero, after a CPU reset, or a EWM refresh cycle. The counter
value is not accessible to the CPU.
22.4.4 EWM Compare Registers
The compare registers CMPL and CMPH are write-once after a CPU reset and cannot be
modified until another CPU reset occurs.
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EWM_out pad must be in pull down state when EWM
functionality is used and when EWM is under Reset.
You must update the CMPH and CMPL registers prior to
enabling the EWM. After enabling the EWM, the counter resets
to zero, therefore providing a reasonable time after a power-on
reset for the external monitoring circuit to stabilize and ensure
that the EWM_in pin is deasserted.
K30 Sub-Family Reference Manual, Rev. 6, Nov 2011
Note
Note
Freescale Semiconductor, Inc.