M306H7MG-XXXFP Datasheet, PDF (188/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

M306H7MG-XXXFP/MC-XXXFP/FGFP
14. EXPANSION FUNCTION
For accessing to CRC register data, set accessing address (CA3 to CA0) (shown in Table 14.3) to CRC register
address control register (address 021216). Then write data (CD15 to CD0) by CRC register data control register
(address 021416). When end the data accessing, CRC register address control register increments address
automatically. Then, next address data writing is possible.
CRC register access registers are shown in Figure 14.5, CRC register access block diagram is shown in Figure 14.6.
The operation example of CRC operation circuit is shown in Figure 14.7. The example of program is shown in
Figure 14.8, and CRC register bit compositions are shown in p191 to p199.
Data bus (16-bit)
(address 021216)
(CA13 to CA8)
CRC register address control register (4)
(CA4)
(CA3 to CA0)
CRC register data control register (16) (address 021416)
(CD15 to CD0)
Increment automatically
after data access
Code data
shift register
Shift counter
Shift control circuit
Generator polynomial register
82 bit CRC operation circuit
Error correction
mode
remainder polynomial register
Figure 14.6
Error judging
circuit
(Majority circuit)
CRC error detection register
Access block diagram for CRC registers
Rev.2.10 Oct 25, 2006 Page 188 of 326
REJ03B0152-0210