HD64F2612FA20 Renesas Electronics America, HD64F2612FA20 Datasheet - Page 376

• Manufacturer Part Number: HD64F2612FA20
• Description: IC H8S MCU FLASH 128K 80QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2600r

Specifications of HD64F2612FA20

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 43
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Section 14 Serial Communication Interface (SCI)
14.4.2
In asynchronous mode, the SCI operates on a basic clock with a frequency of 16 times the transfer
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 internally at the rising edge of the 8th
pulse of the basic clock as shown in figure 14.3. Thus, the reception margin in asynchronous mode
is given by formula (1) below.
Where M : Reception margin
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.
Rev. 7.00 Sep. 11, 2009 Page 340 of 566
REJ09B0211-0700
Internal basic
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 (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 14.3 Receive Data Sampling Timing in Asynchronous Mode
2N
0
1
8 clocks
Start bit
) −
D − 0.5
16 clocks
N
7
− (L − 0.5) F} × 100 [%]
15 0
D0
... Formula (1)
7
15 0
D1