R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 343
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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Quantity
Price
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Part Number:
R4F24278NVFQU
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REALTEK
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H8S/2427, H8S/2427R, H8S/2425 Group
7.12
This LSI can release the external bus in response to a bus request from an external device. In the
external bus released state, internal bus masters except the EXDMAC*
long as there is no external access. If any of the following requests are issued in the external bus
released state, the BREQO signal can be driven low to output a bus request externally.
• When an internal bus master wants to perform an external access
• When a refresh request is generated*
• When a SLEEP instruction is executed to place the chip in software standby mode or all-
Notes: 1. Not supported by the H8S/2425 Group.
7.12.1
In externally expanded mode, the bus can be released to an external device by setting the BRLE
bit to 1 in BCR. Driving the BREQ pin low issues an external bus request to this LSI. When the
BREQ pin is sampled, at the prescribed timing the BACK pin is driven low, and the address bus,
data bus, and bus control signals are placed in the high-impedance state, establishing the external
bus released state.
In the external bus released state, internal bus masters except the EXDMAC*
accesses using the internal bus. When an internal bus master wants to make an external access, it
temporarily defers initiation of the bus cycle, and waits for the bus request from the external bus
master to be canceled. If a refresh request is generated in the external bus released state, or if a
SLEEP instruction is executed to place the chip in software standby mode or all-module-clocks-
stopped mode, refresh control and software standby or all-module-clocks-stopped control is
deferred until the bus request from the external bus master is canceled.
If the BREQOE bit is set to 1 in BCR, the BREQO pin can be driven low when any of the
following requests are issued, to request cancellation of the bus request externally.
• When an internal bus master wants to perform an external access
• When a refresh request is generated*
• When a SLEEP instruction is executed to place the chip in software standby mode or all-
REJ09B0565-0100 Rev. 1.00
Jul 22, 2010
module-clocks-stopped mode
module-clocks-stopped mode
2. The refresh control is not supported by the 5-V version.
Bus Release
Operation
2
2
1
continue to operate as
Section 7 Bus Controller (BSC)
1
can perform
Page 313 of 1448
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