R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 347
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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REALTEK
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H8S/2427, H8S/2427R, H8S/2425 Group
7.13
This LSI has a bus arbiter that arbitrates bus mastership operations (bus arbitration).
There are four bus masters⎯the CPU, DTC, DMAC, and EXDMAC*⎯that perform read/write
operations when they have possession of the bus. Each bus master requests the bus by means of a
bus request signal. The bus arbiter determines priorities at the prescribed timing, and permits use
of the bus by means of a bus request acknowledge signal. The selected bus master then takes
possession of the bus and begins its operation.
Note: * The EXDMAC is not supported by the H8S/2425 Group.
7.13.1
The bus arbiter detects the bus masters’ bus request signals, and if the bus is requested, sends a
bus request acknowledge signal to the bus master. If there are bus requests from more than one
bus master, the bus request acknowledge signal is sent to the one with the highest priority. When a
bus master receives the bus request acknowledge signal, it takes possession of the bus until that
signal is canceled.
The order of priority of the bus mastership is as follows:
An internal bus access by internal bus masters except the EXDMAC*
refresh, and an external bus access by the EXDMAC*
If an external bus release request, a refresh request*
master occur simultaneously, the order of priority is as follows:
As a refresh*
DRAM space by an internal bus master can be executed simultaneously, there is no relative order
of priority for these two operations.
Notes: 1. Not supported by the 5-V version.
REJ09B0565-0100 Rev. 1.00
Jul 22, 2010
(High) EXDMAC*
(High) Refresh*
(High) External bus release > External access by internal bus master except EXDMAC*
2. The EXDMAC is not supported by the H8S/2425 Group.
Bus Arbitration
Operation
1
when the CBRM bit in REFCR is cleared to 0 and an external access other than to
1
> EXDMAC*
2
> DMAC > DTC > CPU (Low)
2
> External bus release (Low)
1
, and an external access by an internal bus
2
can be executed in parallel.
2
, external bus release, a
Section 7 Bus Controller (BSC)
Page 317 of 1448
2
(Low)
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