DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 461

• 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: -

14.3.3
TWCR1 controls the free-running counter (TWCNT) and selects the TWCNT input clock and an
external event signal whose duty is to be measured.
Bit
7
6
5
4
3
2
1
0
Bit Name
FRC
⎯
CKS2
CKS1
CKS0
IS2
IS1
IS0
Duty Measurement Control Register 1 (TWCR1)
Initial Value
0
0
0
0
0
0
0
0
R/W Description
R/W Free-Running Counter
R/W Reserved
R/W
R/W
R/W
R/W
R/W
R/W
When 1 is written to this bit, TWCNT operates as a
free-running counter regardless of the state of the START
bit.
0: Duty measurement operation
1: Free-running counter operation
Clock Select 2 to 0
Select the clock input to TWCNT.
000: Count on internal clock φ
001: Count on internal clock φ/2
010: Count on internal clock φ/4
011: Count on internal clock φ/8
100: Count on internal clock φ/32
101: Count on internal clock φ/2048
110: Count on internal clock φ/32768
111: Count on internal clock φ/65536
Input Select 2 to 0
Select the external event signal whose duty is to be
measured.
000: Measure the duty of HSYNCI_0
001: Measure the duty of HSYNCI_1
010: Measure the duty of CSYNCI_0
011: Measure the duty of CSYNCI_1
100: Measure the duty of HFBACKI
101: Measure the duty of VFBACKI
110: Measure the duty of VSYNCI_0
111: Measure the duty of VSYNCI_1
Rev.2.00 May. 28, 2009 Page 421 of 732
REJ09B0059-0200