r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 692

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
27.2.2
b5 to b2
CRCMS Bit (CRC mode select bit)
CRCPS Bit (CRC polynomial select bit)
CRCSR Bit (Snoop-on-read enable bit)
CRCSW Bit (Snoop-on-write enable bit)
After Reset
Bit
b0
b1
b6
b7
Address 00292h
The CRCMR register is used to control both the CRC snoop and writes to and reads from registers CRCD and
CRCIN.
When writing data from the CPU to the CRCIN register, set both the CRCSW and CRCSR bits to 0.
When the CRCMS bit is set to 0, writes to registers CRCD and CRCIN are performed with the bit order
reversed.
When CRC code is read from the CRCD register, the bit-order-reversed CRC code is read. The bit order must
be reversed by a program.
When the CRCMS bit is set to 1, writes to registers CRCD and CRCIN do not reverse the bit order. When CRC
code is read from the CRCD register, the read CRC code is not bit-order-reversed.
When the CRCPS bit is set to 0, calculation is performed in CRT-CCITT mode and the result is stored in the
CRCD register.
When the CRCPS bit is set to 1, calculation is performed in CRC-16 mode and the result is stored in the CRCD
register.
Setting the CRCSR bit to 1 enables snooping of read operations on the data bus.
When the CRCSR bit is 1, if the address set in the CRCSAR register is read, CRC calculation is performed
automatically on the read data on the data bus and the result is stored in the CRCD register.
When the CRCSR bit is set to 1, set the CRCSW bit to 0.
Setting the CRCSW bit to 1 enables snooping of write operations on the data bus.
When the CRCSW bit is 1, if the address set in the SRCSAR register is written, CRC calculation is performed
automatically on the written data on the data bus and the result is stored in the CRCD register.
When the CRCSW bit is set to 1, set the CRCSR bit to 0.
Symbol CRCSW
Bit
CRC Control Register (CRCMR)
CRCMS CRC mode select bit
CRCSW Snoop-on-write enable bit
CRCSR Snoop-on-read enable bit
CRCPS CRC polynomial select bit
Symbol
—
Preliminary document
Specifications in this document are tentative and subject to change.
b7
0
Nothing is assigned. The write value must be 0. The read value is 0.
CRCSR
b6
0
Bit Name
b5
—
0
b4
—
0
b3
—
0
0: LSB first
1: MSB first
0: X
1: X
0: Disabled
1: Enabled
16
16
+ X
+ X
b2
—
12
15
0
+ X
+ X
5
2
CRCPS
+ 1 (CRC-CCITT)
+ 1 (CRC-16)
Function
b1
0
27. CRC Calculator Function
CRCMS
b0
0
Page 661 of 725
R/W
R/W
R/W
R/W
R/W
—