M306N5FCTFP Renesas Electronics America, M306N5FCTFP Datasheet - Page 230

• Manufacturer Part Number: M306N5FCTFP
• Description: IC M16C MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/6Nr

Specifications of M306N5FCTFP

• Core Processor: M16C/60
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, I²C, IEBus, SIO, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 87
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 26x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

M16C/6N Group (M16C/6N5)
Rev.2.40
REJ09B0011-0240
Figure 18.3 CRC Calculation
Setup procedure and CRC operation when generating CRC code "80C4h"
(2) Write 0000h (initial value)
(4) Write 23h
(1) Reverse the bit positions of the value "80C4h" by program in 1-byte unit.
(3) Write 01h
CRC operation performed by the M16C
Setting procedure
Details of CRC operation
"80h" →
As shown in (3) above, bit position of "01h" (00000001b) written to the CRCIN register is inversed and becomes "10000000b".
Add "1000 0000 0000 0000 0000 0000b", as "10000000b" plus 16 digits, to "0000 0000 0000 0000 0000 0000b", as
"0000 0000 0000 0000b" plus 8 digits as the default value of the CRCD register to perform the modulo-2 division.
"0001 0001 1000 1001b (1189h)", the remainder "1001 0001 1000 1000b (9188h)" with inversed bit position, can be read
from the CRCD register.
When going on to (4) above, "23h (00100011b)" written in the CRCIN register is inversed and becomes "11000100b".
Add "1100 0100 0000 0000 0000 0000b", as "11000100b" plus 16 digits, to "1001 0001 1000 1000 0000 0000b", as
"1001 0001 1000 1000b" plus 8 digits as a remainder of (3) left in the CRCD register to perform the modulo-2 division.
"0000 1010 0100 0001b (0A41h)", the remainder with inversed bit position, can be read from CRCD register.
Apr 14, 2006
Generator polynomial
CRC code: Remainder of a division in which the value written to the CRCIN register with its bit positions reversed is
Generator polynomial: X
1 0001 0000 0010 0001 1000 0000 0000 0000 0000 0000
"01h", "C4h" →
page 208 of 372
divided by the generator polynomial
"23h"
6
b15
b15
b15
+X
1000 1000 0001 0000 1
12
+X
5
[phone] 0001b)
1000 0001 0000 1000 0
1000 1000 0001 0000 1
CRC code
1001 0001 1000 1000
0A41h
1189h
b7
b7
1000 1000
b0
b0
b0
b0
b0
CRCD register
CRCIN register
Two cycles later, the CRC code for "80h," i.e.,
9188h, has its bit positions reversed to become
"1189h" which is stored in the CRCD register.
CRCD register
CRCIN register
Two cycles later, the CRC code for "80C4h," i.e.,
8250h, has its bit positions reversed to become
"0A41h" which is stored in the CRCD register.
CRCD register
Data
operation that complies
with the law given below.
Modulo-2 operation is
0 + 0 = 0
0 + 1 = 1
1 + 0 = 1
1 + 1 = 0
18. CRC Calculation
-1 = 1