DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 267

• 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: -

Table 8.2
Table 8.3
8.3.2
PWDR are 8-bit readable/writable registers. The PWM has eight PWM data registers. Each
PWDR specifies the duty cycle of the basic pulse to be output, and the number of additional pulses.
The value set in PWDR corresponds to the 0/1 ratio in the conversion period. The upper four bits
specify the duty cycle of the basic pulse as 0/16 to 15/16 with a resolution of 1/16. The lower four
bits specify how many additional pulses are to be added within the conversion period comprising
16 basic pulses. Thus, a specification of 0/256 to 255/256 is possible for the 0/1 ratio within the
conversion period. For 256/256 (100%) output, port output should be used.
PWCKE
0
1
Internal Clock
Frequency
φ
φ/2
φ/4
φ/8
φ/16
PWSL
PWM Data Registers 7 to 0 (PWDR7 to PWDR0)
PWCKS
—
0
1
Internal Clock Selection
Resolution, PWM Conversion Period, and Carrier Frequency when φ = 20 MHz
Resolution
50 ns
100 ns
200 ns
400 ns
800 ns
PWCKB
—
—
0
1
PCSR
—
—
0
1
0
1
PWCKA
PWM Conversion
Period
12.8 μs
25.6 μs
51.2 μs
102.4 μs
204.8 μs
Clock input is disabled
φ (system clock) is selected
φ/2 is selected
φ/4 is selected
φ/8 is selected
φ/16 is selected
Description
Rev.2.00 May. 28, 2009 Page 227 of 732
Carrier Frequency
1250 kHz
625 kHz
312.5 kHz
156.3 kHz
78.13 kHz
REJ09B0059-0200
(Initial value)