R5F61665N50FPV Renesas Electronics America, R5F61665N50FPV Datasheet - Page 395

• Manufacturer Part Number: R5F61665N50FPV
• Description: MCU FLASH 512K ROM 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of R5F61665N50FPV

• Core Processor: H8SX
• Core Size: 16/32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, IrDA, SCI, SmartCard, USB
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 92
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; 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: -

9.15
9.15.1
This LSI has a write data buffer function for the external data bus. Using the write data buffer
function enables internal accesses in parallel with external writes or DMAC single address
transfers. The write data buffer function is made available by setting the WDBE bit to 1 in BCR1.
Figure 9.104 shows an example of the timing when the write data buffer function is used. When
this function is used, if an external address space write or a DMAC single address transfer
continues for two cycles or longer, and there is an internal access next, an external write only is
executed in the first two cycles. However, from the next cycle onward, internal accesses (on-chip
memory or internal I/O register read/write) and the external address space write rather than
waiting until it ends are executed in parallel.
Write to
external
space
Figure 9.104 Example of Timing when Write Data Buffer Function is Used
Write Data Buffer Function
Write Data Buffer Function for External Data Bus
Iφ
Internal
address bus
Bφ
Address bus
CSn
LHWR, LLWR
D15 to D0
T
1
External write cycle
On-chip
memory 1
On-chip memory read
External address
T
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2
memory 2
On-chip
Section 9 Bus Controller (BSC)
Peripheral module address
Peripheral module read
REJ09B0498-0200
T
3