R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 397
R4F24278NVFQU
Manufacturer Part Number
R4F24278NVFQU
Description
MCU 512K/48K 2.7-5.5V 144-LQFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2400r
Datasheet
1.R4F24278NVFQU.pdf
(1482 pages)
Specifications of R4F24278NVFQU
Core Processor
H8S/2600
Core Size
16/32-Bit
Speed
33MHz
Connectivity
EBI/EMI, I²C, IrDA, SCI, Smart Card, SPI, SSU, UART/USART
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
98
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Eeprom Size
-
Ram Size
64K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 16x10b; D/A 2x8b
Oscillator Type
External
Operating Temperature
-20°C ~ 75°C
Package / Case
144-LQFP
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
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H8S/2427, H8S/2427R, H8S/2425 Group
8.4.2
If an external request (DREQ pin) is specified as a DMAC activation source, the relevant port
should be set to input mode in advance*. Level sensing or edge sensing can be used for external
requests.
External request operation in normal mode of short address mode or full address mode is
described below.
When edge sensing is selected, a byte or word is transferred each time a high-to-low transition is
detected on the DREQ pin. The next data transfer may not be performed if the next edge is input
before data transfer is completed.
When level sensing is selected, the DMAC stands by for a transfer request while the DREQ pin is
held high. While the DREQ pin is held low, transfers continue in succession, with the bus being
released each time a byte or word is transferred. If the DREQ pin goes high in the middle of a
transfer, the transfer is interrupted and the DMAC stands by for a transfer request.
In common register enabled mode, external requests are available only for channels 1, 3, 4, and 5.
External requests must not be simultaneously specified as the activation sources for channels 1
and 4. External requests must not be simultaneously specified as the activation sources for
channels 3 and 5.
In common register disabled mode, external requests are available only for channels 0, 1, 4, and 5.
External requests must not be simultaneously specified as the activation sources for channels 0
and 4. External requests must not be simultaneously specified as the activation sources for
channels 1 and 5.
Note: * If the relevant port is set as an output pin for another function, DMA transfers using the
8.4.3
Auto-request is activated by register setting only, and transfer continues to the end. With auto-
request activation, cycle steal mode or burst mode can be selected.
In cycle steal mode, the DMAC releases the bus to another bus master each time a byte or word is
transferred. DMA and CPU cycles are usually repeated alternately. In burst mode, the DMAC
keeps possession of the bus until the end of the transfer so that transfer is performed continuously.
REJ09B0565-0100 Rev. 1.00
Jul 22, 2010
Activation by External Request
Activation by Auto-Request
channel in question cannot be guaranteed.
Section 8 DMA Controller (DMAC)
Page 367 of 1448
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