DF36054GFPJV Renesas Electronics America, DF36054GFPJV Datasheet - Page 327

• Manufacturer Part Number: DF36054GFPJV
• Description: MCU 3/5V 32K J-TEMP PB-FREE 64-L
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300H Tinyr

Specifications of DF36054GFPJV

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, SCI, SSU
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 45
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

14.8.4
In asynchronous mode, the SCI3 operates on a basic clock with a frequency of 14 times the
transfer rate. In reception, the SCI3 samples the falling edge of the start bit using the basic clock,
and performs internal synchronization. Receive data is latched internally at the rising edge of the
8th pulse of the basic clock as shown in figure 14.19. Thus, the reception margin in asynchronous
mode is given by formula (1) below.
[Legend]
N: Ratio of bit rate to clock (N = 14)
D: Clock duty (D = 0.5 to 1.0)
L: Frame length (L = 9 to 12)
F: Absolute value of clock rate deviation
Assuming values of F (absolute value of clock rate deviation) = 0 and D (clock duty) = 0.5 in
formula (1), the reception margin can be given by the formula.
However, this is only the computed value, and a margin of 20% to 30% should be allowed for in
system design.
M = (0.5 –
M = {0.5 – 1/(2
Receive Data Sampling Timing and Reception Margin in Asynchronous Mode
Internal basic
clock
Receive data
(RxD)
Synchronization
sampling timing
Data sampling
timing
Figure 14.19 Receive Data Sampling Timing in Asynchronous Mode
2N
1
) –
14)}
0
D – 0.5
8 clocks
Start bit
N
100 [%] = 46.875%
16 clocks
– (L – 0.5) F
7
Section 14 Serial Communication Interface 3 (SCI3)
100(%)
15 0
Rev. 4.00 Mar. 15, 2006 Page 293 of 556
D0
7
... Formula (1)
REJ09B0026-0400
15 0
D1