DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 281

• 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: -

9.5
A PWM waveform like the one shown in figure 9.2 is output from the PWX pin. Data in DADR
corresponds to the total width (T
when CFS = 0, 64 pulses when CFS = 1). When OS = 0, this waveform is directly output. When
OS = 1, the output waveform is inverted, and data in DADR value corresponds to the total width
(T
Table 9.4 summarizes the relationships between the CKS and CFS bit settings and the resolution,
base cycle, and conversion cycle. The PWM output remains fixed unless the contents of DADR
are at least a certain minimum value. The relationship between the OS bit and the output
waveform is shown in figures 9.3 and 9.4.
H
) of the high (1) output pulses. Figures 9.3 and 9.4 show the types of output waveform.
Operation
Base cycle
(T × 64 or T × 256)
t
L
t
f
Figure 9.2 PWMX (D/A) Operation
L
) of the low (0) pulses output in one conversion cycle (256 pulses
(T × 2
1 conversion cycle
14
(= 16384))
T:
T
(When CFS = 0, m = 256
When CFS = 1, m = 64)
Rev.2.00 May. 28, 2009 Page 241 of 732
L
Resolution
= Σ t
n = 1
m
Ln
(OS = 0)
REJ09B0059-0200