MK30DN512ZVLK10 Freescale Semiconductor, MK30DN512ZVLK10 Datasheet - Page 652

• 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
30.3 Functional description
30.3.1 CRC initialization/re-initialization
To enable the CRC calculation, the user must program the WAS, POLYNOMIAL, and
necessary parameters for transpose and CRC result inversion in the applicable registers.
Asserting the CTRL[WAS] bit enables the programming of the seed value into the CRC
data register.
After a completed CRC calculation, re-asserting the CTRL[WAS] bit and programming a
seed (whether the value is new or a previously used seed value) re-initialize the CRC
module for a new CRC computation. All other parameters must be set before
programming the seed value and subsequent data values.
30.3.2 CRC calculations
In 16-bit and 32-bit CRC modes, data values can be programmed 8 bits, 16 bits, or 32 bits
at a time, provided all bytes are contiguous. Non-contiguous bytes can lead to an
incorrect CRC computation.
30.3.2.1 16-bit CRC
Compute a 16-bit CRC with the following steps:
652
1. Clear the CTRL[TCRC] bit to enable 16-bit CRC mode.
2. Program the transpose and complement options in the CTRL register as required for
3. Write a 16-bit polynomial to the GPOLY[LOW] field. The GPOLY[HIGH] field is
4. Set the CTRL[WAS] bit to program the seed value.
Reserved
the CRC calculation. See
not usable in 16-bit CRC mode.
TCRC
23–0
Field
24
Width of CRC protocol.
0
1
This read-only field is reserved and always has the value zero.
16-bit CRC protocol.
32-bit CRC protocol.
K30 Sub-Family Reference Manual, Rev. 6, Nov 2011
CRC_CTRL field descriptions (continued)
Transpose feature
Description
and
CRC result complement
Freescale Semiconductor, Inc.
for details.