M30800SFP-BL#U5 Renesas Electronics America, M30800SFP-BL#U5 Datasheet - Page 191

• Manufacturer Part Number: M30800SFP-BL#U5
• Description: MCU 3/5V 0K,PB-FREE 100-QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/80r

Specifications of M30800SFP-BL#U5

• Core Processor: M16C/80
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SIO, UART/USART
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 45
• Program Memory Type: ROMless
• Ram Size: 10K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 10x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

M
R
R
23. CRC Calculation Circuit
e
E
1
v
Figure 23.1 Block diagram of CRC circuit
Figure 23.2 CRC-related registers
J
6
1 .
0
The Cyclic Redundancy Check (CRC) calculation circuit detects an error in data blocks. The microcom-
puter uses a generator polynomial of CRC_CCITT (X
The CRC code is a 16-bit code generated for a block of a given data length in multiples of 8 bits. The CRC
code is set in a CRC data register each time one byte of data is transferred to a CRC input register after
writing an initial value into the CRC data register. Generation of CRC code for one byte of data is com-
pleted in two machine cycles.
Figure 23.1 shows the block diagram of the CRC circuit. Figure 23.2 shows the CRC-related registers.
C
9
0 .
8 /
B
0
0
0
1
A
8
G
u
7
o r
. g
0 -
u
(b15)
1
0
CRC data register
b7
b7
CRC input register
p
0
, 2
0
2
0
0
5
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(b8)
b0 b7
b0
CRC input register (8)
f o
CRC calculation result output register
Data input register
3
Data bus high-order bits
2
Data bus low-order bits
CRC code generating circuit
9
Eight low-order bits
CRC data register (16)
x
16
b0
+ x
12
+ x
(Address 037E
Symbol
CRCD
Symbo
CRCIN
Function
Function
5
+ 1
16
+ X
12
16
037D
)
+ X
Eight high-order bits
Address
Address
16
037E
5
, 037C
+ 1) to generate CRC code.
16
(Addresses 037D
16
0000
23. CRC Calculation Circuit
Values that
Values that
can be set
Indeterminate
00
can be set
Indeterminate
When reset
When reset
16
16
to FFFF
to FF
16
16
, 037C
16
R
R
W
W
16
)