DF3026X25V Renesas Electronics America, DF3026X25V Datasheet - Page 451
![MCU 3V 256K PB-FREE 100-TQFP](/photos/28/61/286123/100-tqfp__100-vqfp_sml.jpg)
DF3026X25V
Manufacturer Part Number
DF3026X25V
Description
MCU 3V 256K PB-FREE 100-TQFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Specifications of DF3026X25V
Core Processor
H8/300H
Core Size
16-Bit
Speed
25MHz
Connectivity
SCI, SmartCard
Peripherals
PWM, WDT
Number Of I /o
70
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
8K 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
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF3026X25V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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The receive margin in asynchronous mode can therefore be expressed as shown in equation (1).
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:
Note: In operation with an external clock source, be sure that t >4 states.
When an external clock source is used for the serial clock, after updates TDR, allow an
inversion of at least five system clock ( ) 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: 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
M = (0.5 –
= 46.875%
t
Figure 12.22 Example of Synchronous Transmission
2
2N
1
1
D0
16
) – (L – 0.5) F –
)
100%
D1
D2
D – 0.5
N
D3
(1 + F)
Section 12 Serial Communication Interface
Rev. 2.00 Sep 20, 2005 page 411 of 800
D4
100%
D5
. . . . . . . . (1)
. . . . . . . . (2)
D6
REJ09B0260-0200
D7
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