D13008VXI25V Renesas Electronics America, D13008VXI25V Datasheet - Page 426
D13008VXI25V
Manufacturer Part Number
D13008VXI25V
Description
MCU 3V 0K I-TEMP PB-FREE 100-TQF
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Specifications of D13008VXI25V
Core Processor
H8/300H
Core Size
16-Bit
Speed
25MHz
Connectivity
SCI, SmartCard
Peripherals
PWM, WDT
Number Of I /o
35
Program Memory Type
ROMless
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 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
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
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12. Serial Communication Interface
The receive margin in asynchronous mode can therefore be expressed as shown in equation (1).
Legend:
M: Receive margin (%)
N: Ratio of clock frequency to bit rate (N = 16)
D: Clock duty cycle (D = 0 to 1.0)
L: Frame length (L = 9 to 12)
F: Absolute deviation of clock frequency
From equation (1), if F = 0 and D = 0.5, the receive margin is 46.875%, as given by equation (2).
When D = 0.5 and F = 0:
This is a theoretical value. A reasonable margin to allow in system designs is 20% to 30%.
Restrictions on Use of an External Clock Source:
• When an external clock source is used for the serial clock, after updates TDR, allow an
Rev.4.00 Aug. 20, 2007 Page 380 of 638
REJ09B0395-0400
Note: In operation with an external clock source, be sure that t >4 states.
inversion of at least five system clock (φ) cycles before input of the serial clock to start
transmitting. If the serial clock is input within four states of the TDR update, a malfunction
may occur. (See figure 12.22)
SCK
TDRE
M = (0.5 −
M = (0.5 −
= 46.875%
t
Figure 12.22 Example of Synchronous Transmission
2 × 16
2N
D0
1
1
) − (L − 0.5) F −
) × 100%
D1
D2
D − 0.5
N
D3
(1 + F) × 100%
D4
D5
. . . . . . . . (1)
. . . . . . . . (2)
D6
D7
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