R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 967
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
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H8S/2427, H8S/2427R, H8S/2425 Group
16.4.2
In asynchronous mode, the SCI operates on a basic clock with a frequency of 16 times the bit rate.
In reception, the SCI samples the falling edge of the start bit using the basic clock, and performs
internal synchronization. Receive data is latched at the middle of each bit by sampling the data at
the rising edge of the 8th pulse of the basic clock as shown in figure 16.3. Thus the reception
margin in asynchronous mode is given by formula (1) below.
Where M: Reception Margin
Assuming values of F = 0 and D = 0.5 in formula (1), a reception margin is given by formula
below.
However, this is only the computed value, and a margin of 20% to 30% should be allowed in
system design.
REJ09B0565-0100 Rev. 1.00
Jul 22, 2010
Internal base
clock
Receive data
(RxD)
Synchronization
sampling timing
Data sampling
timing
M = { (0.5 –
N: Ratio of bit rate to clock (N = 16)
D: Clock duty cycle (D = 0.5 to 1.0)
L: Frame length (L = 9 to 12)
F: Absolute value of clock rate deviation
M = {0.5 – 1/(2 × 16)} × 100 [%] = 46.875%
Receive Data Sampling Timing and Reception Margin in Asynchronous Mode
Figure 16.3 Receive Data Sampling Timing in Asynchronous Mode
0
2N
8 clocks
Start bit
1
) – (L – 0.5) F –
16 clocks
7
⏐D – 0.5⏐
N
Section 16 Serial Communication Interface (SCI, IrDA, CRC)
15 0
(1 + F) } × 100 [%]
D0
7
... Formula (1)
Page 937 of 1448
15 0
D1
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