M30803FGFP#D5 Renesas Electronics America, M30803FGFP#D5 Datasheet - Page 191
M30803FGFP#D5
Manufacturer Part Number
M30803FGFP#D5
Description
MCU 3/5V 256K 100-QFP
Manufacturer
Renesas Electronics America
Series
M16C™ M16C/80r
Datasheet
1.M30803FGGPU3.pdf
(360 pages)
Specifications of M30803FGFP#D5
Core Processor
M16C/80
Core Size
16-Bit
Speed
20MHz
Connectivity
SIO, UART/USART
Peripherals
DMA, PWM, WDT
Number Of I /o
85
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
20K 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
Contains lead / RoHS non-compliant
Eeprom Size
-
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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
Page 178
(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
)
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