DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 284

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

An example of the additional pulses when CFS = 1 (base cycle = resolution (T) × 256) and OS = 1
(inverted PWM output) is described below. When CFS = 1, the upper eight bits (DA13 to DA6) in
DADR determine the duty cycle of the base pulse while the subsequent six bits (DA5 to DA0)
determine the locations of the additional pulses as shown in figure 9.5.
Table 9.5 lists the locations of the additional pulses.
Rev.2.00 May. 28, 2009 Page 244 of 732
REJ09B0059-0200
DA13 DA12 DA11 DA10 DA9
Figure 9.4 Output Waveform (OS = 1, DADR Corresponds to T
t
t
t
H1
f1
H1
t
t
t
Duty cycle of base pulse
H1
Figure 9.5 D/A Data Register Configuration when CFS = 1
f1
H1
= t
+ t
= t
+ t
t
f1
t
f2
f1
H2
f2
H2
= t
= t
+ t
+ t
f3
f3
H3
= ··· = t
H3
= ··· = t
+ ··· + t
+ ··· + t
t
f255
H2
t
f63
H2
a. CFS = 0 [base cycle = resolution (T)
b. CFS = 1 [base cycle = resolution (T)
H255
DA8
H63
= t
= t
t
f2
t
f2
f256
f64
+ t
+ t
= T 256
H64
H256
= T 64
DA7
= T
= T
1 conversion cycle
1 conversion cycle
H
H
DA6
t
H3
t
H3
DA5
Location of additional pulses
DA4
t
H255
t
H63
t
DA3
f255
t
f63
256]
64]
DA2
t
H256
t
DA1
H64
t
f256
t
f64
DA0
H
)
CFS
1
1