HD64F3687GH Renesas Electronics America, HD64F3687GH Datasheet - Page 335
HD64F3687GH
Manufacturer Part Number
HD64F3687GH
Description
IC H8 MCU FLASH 56K 64-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300H Tinyr
Datasheet
1.HD64F3684GFPV.pdf
(538 pages)
Specifications of HD64F3687GH
Core Processor
H8/300H
Core Size
16-Bit
Speed
20MHz
Connectivity
I²C, SCI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
45
Program Memory Size
56KB (56K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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16.8.4
In asynchronous mode, the SCI3 operates on a basic clock with a frequency of 16 times the
transfer rate. In reception, the SCI3 samples the falling edge of the start bit using the basic clock,
and performs internal synchronization. Receive data is latched internally at the rising edge of the
8th pulse of the basic clock as shown in figure 16.19. Thus, the reception margin in asynchronous
mode is given by formula (1) below.
M = (0.5 –
Legend N : Ratio of bit rate to clock (N = 16)
Assuming values of F (absolute value of clock rate deviation) = 0 and D (clock duty) = 0.5 in
formula (1), the reception margin can be given by the formula.
M = {0.5 – 1/(2 16)} 100 [%] = 46.875%
However, this is only the computed value, and a margin of 20% to 30% should be allowed for in
system design.
D : Clock duty (D = 0.5 to 1.0)
L : Frame length (L = 9 to 12)
F : Absolute value of clock rate deviation
Receive Data Sampling Timing and Reception Margin in Asynchronous Mode
Internal basic
clock
Receive data
(RxD)
Synchronization
sampling timing
Data sampling
timing
2N
Figure 16.19 Receive Data Sampling Timing in Asynchronous Mode
1
) –
D – 0.5
N
0
– (L – 0.5) F
8 clocks
Start bit
16 clocks
7
100(%)
Section 16 Serial Communication Interface 3 (SCI3)
15 0
D0
Rev.5.00 Nov. 02, 2005 Page 301 of 500
7
... Formula (1)
REJ09B0027-0500
15 0
D1
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