DF2148RTE20IV Renesas Electronics America, DF2148RTE20IV Datasheet - Page 535

• Manufacturer Part Number: DF2148RTE20IV
• Description: MCU 5V 128K I-TEMP,PB-FREE, 100-
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148RTE20IV

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Thus the receive margin in asynchronous mode is given by equation (1) below.
Where M: Receive margin (%)
Assuming values of F = 0 and D = 0.5 in equation (1), a receive margin of 46.875% is given by
equation (2) below.
When D = 0.5 and F = 0,
However, this is only a theoretical value, and a margin of 20% to 30% should be allowed in
system design.
Internal base
clock
Receive data
(RxD)
Synchronization
sampling timing
Data sampling
timing
N: Ratio of bit rate to clock (N = 16)
D: Clock duty (D = 0 to 1.0)
L: Frame length (L = 9 to 12)
F: Absolute value of clock rate deviation
M = 0.5 –
M =
= 46.875%
Figure 15.23 Receive Data Sampling Timing in Asynchronous Mode
0.5 –
0
2
2N
1
1
8 clocks
16
Start bit
– (L – 0.5)F –
100%
16 clocks
7
D – 0.5
N
Section 15 Serial Communication Interface (SCI, IrDA)
(1 + F)
15 0
Rev. 4.00 Sep 27, 2006 page 489 of 1130
100%
D0
7
.......... (1)
.......... (2)
REJ09B0327-0400
15 0
D1