M3087BFLBGP#U5 Renesas Electronics America, M3087BFLBGP#U5 Datasheet - Page 341

• Manufacturer Part Number: M3087BFLBGP#U5
• Description: IC M32C/87 MCU FLASH 144LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M32C/80r

Specifications of M3087BFLBGP#U5

• Core Processor: M32C/80
• Core Size: 16/32-Bit
• Speed: 32MHz
• Connectivity: EBI/EMI, I²C, IEBus, IrDA, SIO, UART/USART
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 121
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 34x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 144-LQFP
• For Use With: R0K330879S001BE - KIT DEV RSK M32C/87R0K330879S000BE - KIT DEV RSK M32C/87
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

M32C/87 Group (M32C/87, M32C/87A, M32C/87B)
REJ09B0180-0151 Rev.1.51 Jul 31, 2008
Page 317 of 587
Figure 20.3
Generator
polynomial
CRC Calculation and Setup Procedure to Generate CRC Code for 80C4h
(1) Invert a bit position of 80C4h per byte by a program
(2) Set 0000h (default value)
(3) Set 01h
(4) Set 23h
CRC Calculation for M32C
Setting Steps
Details of CRC Calculation
CRC code: a remainder of division,
Generator polynomial: X
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 inverted to 11000100b.
Add 1100 0100 0000 0000 0000 0000b plus 16 digits, to 1001 0001 1000 1000b as a remainder of (3) left in the
CRCD register to perform the modulo-2 division.
0000 1010 0100 0001b (0A41h), the remainder with inverted bit position, can be read from CRCD register.
As shown in (3) above, bit position of 01h (00000001b) written to the CRCIN register is inverted to 10000000b.
Add 1000 0000 0000 0000 0000 0000b, as 10000000b plus 16 digits, to 0000h as the initial value of the CRCD
register to perform the modulo-2 division.
1 0001 0000 0010 0001 1000 0000 0000 0000 0000 0000
80h
CRC Calculation
01h, C4h
16
23h
+ X
1000 1000 0001 0000 1
CRC code
12
+ X
b15
b15
b15
1000 0001 0000 1000 0
1000 1000 0001 0000 1
5
+ 1 (1 0001 0000 0010 0001b)
1001 0001 1000 1000
value of the CRCIN register with inversed bit position
0A41h
1189h
1000 1000
b7
b7
Generator polynomial
Data
b0
b0
b0
b0
b0
CRCD register
CRCIN register
CRCD register
CRCIN register
CRCD register
Bit position of the CRC code for 80h (9188h)
is inverted to 1189h, which is stored into the
CRCD register in the 3rd cycle.
Bit position of the CRC code for 80C4h
(8250h) is inverted to 0A41h, which is stored
into the CRCD register in the 3rd cycle.
calculated on the law below
Modulo-2 Arithmetic is
0 + 0 = 0
0 + 1 = 1
1 + 0 = 1
1 + 1 = 0
-1 = 1
20. CRC Calculation