UPD70F3738GF-GAS-AX Renesas Electronics America, UPD70F3738GF-GAS-AX Datasheet - Page 893

• Manufacturer Part Number: UPD70F3738GF-GAS-AX
• Description: MCU 32BIT V850ES/JX3-L 100-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Lr

Specifications of UPD70F3738GF-GAS-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CSI, EBI/EMI, I²C, UART/USART
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 84
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.2 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: -

data when transmitting/receiving data consisting of several bytes.
1000B) is transmitted LSB-first.
Communication errors can easily be detected if the CRC code is transmitted/received along with transmit/receive
The following figure shows an example when all of the data 12345678H (0001 0010 0011 0100 0101 0110 0111
Processing on transmitting side
Processing 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
<3> When transmitting several bytes of data, write the same data to the CRCIN register each time transmit
<4> After all the data has been transmitted, write the contents of the CRCD register (CRC code) to the
<5> If a resend is requested by the transmitting side, resend the data.
<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 every time reception ends.
<4> Next, the CRC code is transmitted from the transmitting side, so write this data to the CRCIN register
<5> When reception of all the data, including the CRC code, has been completed, reception was normal if the
same data to the CRCIN register.)
data is written to the transmit buffer register.
transmit buffer register and transmit them. (The data is transmitted LSB-first, starting from the lower
bytes, and 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.)
similarly 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 27-4. CRC Transmission Example
Transmit/receive data
(12345678H)
CHAPTER 27 CRC FUNCTION
56
User’s Manual U18953EJ5V0UD
34
12
F6
CRC code
(08F6H)
08
891