DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 371

• Manufacturer Part Number: DF2148ATE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148ATE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2148ATE20; HD64F2148ATE20

11.3
11.3.1
FRC increments on a pulse generated once for each period of the selected (internal or external)
clock source.
Internal Clock
Any of three internal clocks ( /2, /8, or /32) created by division of the system clock ( ) can be
selected by making the appropriate setting in bits CKS1 and CKS0 in TCR. Figure 11.3 shows the
increment timing.
External Clock
If external clock input is selected by bits CKS1 and CKS0 in TCR, FRC increments on the rising
edge of the external clock signal.
The pulse width of the external clock signal must be at least 1.5 system clock ( ) periods. The
counter will not increment correctly if the pulse width is shorter than 1.5 system clock periods.
Figure 11.4 shows the increment timing.
Internal
clock
FRC input
clock
FRC
Operation
FRC Increment Timing
Figure 11.3 Increment Timing with Internal Clock Source
N – 1
N
Rev. 4.00 Sep 27, 2006 page 325 of 1130
Section 11 16-Bit Free-Running Timer
REJ09B0327-0400
N + 1