R4F24569NVFQV Renesas Electronics America, R4F24569NVFQV Datasheet - Page 434
R4F24569NVFQV
Manufacturer Part Number
R4F24569NVFQV
Description
MCU 256KB FLASH 64K 144-LQFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2400r
Specifications of R4F24569NVFQV
Core Processor
H8S/2600
Core Size
16/32-Bit
Speed
32MHz
Connectivity
EBI/EMI, I²C, IrDA, SCI, SSU, UART/USART, USB
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
96
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
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
Eeprom Size
-
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Section 7 DMA Controller (DMAC)
(3)
When the WDBE bit of BCR in the bus controller is set to 1, enabling the write data buffer
function, dual address transfer external write cycles or single address transfers and internal
accesses (on-chip memory or internal I/O registers) are executed in parallel.
•
•
(4)
If the last transfer cycle is for an internal address, note that even if low-level output at the TEND
pin has been set, a low level may not be output at the TEND pin under the following external bus
conditions since the last transfer cycle (internal bus cycle) and the external bus cycle are executed
in parallel.
1. EXDMAC cycle*
2. Write cycle with write buffer mode enabled
3. DMAC single address cycle for a different channel with write buffer mode enabled
4. Bus release cycle
5. CBR refresh cycle
Figure 7.41 shows an example in which a low level is not output from the TEND pin in case 2
above.
If the last transfer cycle is an external address cycle, a low level is output at the TEND pin in
synchronization with the bus cycle.
Page 404 of 1392
If the setting of a register that controls external accesses is changed during execution of an
external access by means of the write data buffer function, the external access may not be
performed normally. Registers that control external accesses should only be manipulated when
external reads, etc., are used with DMAC operation disabled, and the operation is not
performed in parallel with external access.
The DMAC can start its next operation during external access using the write data buffer
function. Consequently, the DREQ pin sampling timing, TEND output timing, etc., are
different from the case in which the write data buffer function is disabled. Also, internal bus
cycles maybe hidden, and not visible.
Write data buffer function and DMAC register setting
Write data buffer function and next DMAC operation
Write Data Buffer Function
TEND Output
H8S/2456, H8S/2456R, H8S/2454 Group
REJ09B0467-0350 Rev. 3.50
Jul 07, 2010
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