UPD70F3738GF-GAS-AX Renesas Electronics America, UPD70F3738GF-GAS-AX Datasheet - Page 784

• 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: -

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(12) Read values of DSAn and DDAn registers
(13) Setting up DMA transfer again
If the DSAn and DDAn registers are read during a DMA transfer, the values before and after the registers
were updated might be read.
For example, if the DSAnH register and then the DSAnL register are read when the DMA transfer source
address (DSAn register) is 0000FFFFH and the count direction is incremental (DADCn.SAD1 and
DADCn.SAD0 bits = 00), the value of the DSAnL register differs as follows, depending on whether DMA
transfer is executed immediately after the DSAnH register is read.
(a) If DMA transfer does not occur while DSAn register is being read
(b) If DMA transfer occurs while DSAn register is being read
When re-specifying DMA settings by using the DDAnH, DDAnL, DSAnH, DSAnL, DBCn, and DADCn
registers during the current DMA (the TCn bit is set to 1), be sure to initialize the DMA channels first. The
DMA transfer must be initialized using the procedure described in 20.13 (4) DMA transfer initialization
procedure.
<1> Reading DSAnH register value: DSAnH register = 0000H
<2> Reading DSAnL register value: DSAnL register = FFFFH
<1> Reading DSAnH register value: DSAnH register = 0000H
<2> Occurrence of DMA transfer
<3> Incrementing DSAn register: DSAn register = 00010000H
<4> Reading DSAnL register value: DSAnL register = 0000H
CHAPTER 20 DMA FUNCTION (DMA CONTROLLER)
User’s Manual U18953EJ5V0UD