DF2345TE20 Renesas Electronics America, DF2345TE20 Datasheet - Page 499

• Manufacturer Part Number: DF2345TE20
• Description: MCU 5V 128K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2345TE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 71
• 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 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2345TE20; HD64F2345TE20

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 of 46.875% is given by
formula (2) below.
When D = 0.5 and F = 0,
However, this is only the computed value, and a margin of 20% to 30% should be allowed in
system design.
Internal basic
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 = (0.5 –
= 46.875%
Figure 12.21 Receive Data Sampling Timing in Asynchronous Mode
0
2
2N
1
1
8 clocks
Start bit
16
) – (L – 0.5) F –
)
100%
16 clocks
7
D – 0.5
N
Section 12 Serial Communication Interface (SCI)
15 0
(1 + F)
Rev. 4.00 Feb 15, 2006 page 473 of 900
D0
100%
. . . . . . . . Formula (1)
. . . . . . . . Formula (2)
7
REJ09B0291-0400
15 0
D1