m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 261
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m5m51016btp
Manufacturer Part Number
m5m51016btp
Description
Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M5M51016BTP.pdf
(367 pages)
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M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Operation (1) The bit 1 of CRC mode register selects either CRC-CCITT or CRC-16, and the bit 7 selects
2.11.3 SFR Access Snoop Function
The CRC calculation circuit includes the ability to snoop write/read to/from the SFR addresses and to
execute CRC automatic calculation (SFR access snoop function). In order to execute CRC calculation for
data which have been written/read to/from the SFR, setting data to CRC input register again is not re-
quired. The target SFRs include USB-related registers, UART-related registers, and Serial Sound Inter-
face-related registers.
(2) The target SFR addresses are set to CRC snoop address register (bit 0 to 9 of CRCSAR).
(3) The initial value 0000
(4) If writing into the target SFR is executed by either the CPU or DMA while “1” is set to CRC
(5) When 1-byte data is stored in CRC input register, CRC codes are generated in CRC data
either LSB first or MSB first.
Snooping of writing to the target SFR is enabled with CRC snoop on write enable bit (bit 15 of
CRCSAR), and snooping of reading from the target SFR is enabled with CRC snoop on read
enable bit (bit 14 of CRCSAR).
snoop on write enable bit, the CRC calculation circuit will store the data written to the target
SFR in CRC input register, and executes CRC calculation. Similarly, if reading from the target
SFR by the CPU or DMA while “1” is set to CRC snoop on read enable bit, calculation circuit
will store the data read from the target SFR in CRC input register, and executes CRC calcu-
lation. The CRC calculation circuit can only calculate CRC codes on data 1-byte at a time.
Therefore, if a target SFR is accessed in a word (16-bit) bus cycle, only 1-byte data are stored
into CRC input register.
register based on the stored data and the content of CRC data register. Generation of CRC
codes for 1-byte of data is completed in two machine cycles.
page 252 of 354
16
is set to CRC data register.
2. CRC Calculation Circuit
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