UPD70F3740GC-UEU-AX Renesas Electronics America, UPD70F3740GC-UEU-AX Datasheet - Page 734

• Manufacturer Part Number: UPD70F3740GC-UEU-AX
• Description: MCU 32BIT V850ES/JX3 100-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3r

Specifications of UPD70F3740GC-UEU-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 32MHz
• Connectivity: CSI, EBI/EMI, I²C, UART/USART
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 84
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 3.6 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

V850ES/JG3
when transmitting/receiving data consisting of several bytes.
LSB-first as an example.
R01UH0015EJ0300 Rev.3.00
Sep 30, 2010
Communication errors can easily be detected if the CRC code is transmitted/received along with transmit/receive data
The following is an illustration using the transmission of 12345678H (0001 0010 0011 0100 0101 0110 0111 1000B)
Setting procedure on transmitting side
Setting procedure on receiving side
<1> Write the initial value 0000H to the CRCD register.
<2> Write the 1 byte of data to be transmitted first to the transmit buffer register. (At this time, also write the same
<3> When transmitting several bytes of data, write the same data to the CRCIN register each time transmit data is
<4> After all the data has been transmitted, write the contents of the CRCD register (CRC code) to the transmit
<1> Write the initial value 0000H to the CRCD register.
<2> When reception of the first 1 byte of data is complete, write that receive data to the CRCIN register.
<3> If receiving several bytes of data, write the receive data to the CRCIN register upon every reception completion.
<4> Next, the CRC code is transmitted from the transmitting side, so write this data to the CRCIN register similarly
<5> When reception of all the data, including the CRC code, has been completed, reception was normal if the
data to the CRCIN register.)
written to the transmit buffer register.
buffer register and transmit them. (Since this is LSB first, transmit the data starting from the lower bytes, then
the higher bytes.)
(In the case of normal reception, when all the receive data has been written to the CRCIN register, the
contents of the CRCD register on the receiving side and the contents of the CRCD register on the transmitting
side are the same.)
to receive data.
contents of the CRCD register are 0000H. If the contents of the CRCD register are other than 0000H, this
indicates a communication error, so transmit a resend request to the transmitting side.
78
Figure 25-4. CRC Transmission Example
Transmit/receive data
(12345678H)
56
34
12
F6
CRC code
(08F6H)
08
CHAPTER 25 CRC FUNCTION
Page 718 of 870