HD6417011VX20V Renesas Electronics America, HD6417011VX20V Datasheet - Page 240

• Manufacturer Part Number: HD6417011VX20V
• Description: MPU 5V 0K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7010r

Specifications of HD6417011VX20V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, SCI
• Peripherals: POR, PWM
• Number Of I /o: 11
• Program Memory Type: ROMless
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 7x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

The receive margin in the asynchronous mode can therefore be expressed as:
From the equation above, if F = 0 and D = 0.5 the receive margin is 46.875%:
This is a theoretical value. A reasonable margin to allow in system designs is 20–30%.
230
Synchronization
sampling timing
sampling timing
Base clock
data (RxD)
M : Receive margin (%)
N : Ratio of clock frequency to bit rate (N = 16)
D : Clock duty cycle (D = 0–1.0)
L : Frame length (L = 9–12)
F : Absolute deviation of clock frequency
D = 0.5, F = 0
M = (0.5 – 1/(2
M = (0.5 –
Receive
= 46.875%
Data
0
2N
1
8 clocks
Start bit
Figure 12.13 Receive Data Sampling Timing
) – (L – 0.5) F –
16))
16 clocks
100%
7 8
–7.5 clocks
D – 0.5
N
15 0
+7.5 clocks
(1 + F)
D0
100%
7 8
15 0
D1
5