DF2148BTE20 Renesas Electronics America, DF2148BTE20 Datasheet - Page 691

• Manufacturer Part Number: DF2148BTE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148BTE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, IrDA, SCI, X-Bus
• Peripherals: 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): 4.5 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: HD64F2148BTE20; HD64F2148BTE20

Table 24.2 Crystal Resonator Parameters
24.1.2
Figure 24.4 shows a typical method of connecting an external clock signal. To leave the XTAL pin
open, incidental capacitance should be 10 pF or less.
To input an inverted clock to the XTAL pin, the external clock should be set to high in standby
mode, subactive mode, subsleep mode, and watch mode. External clock input conditions are
shown in table 24.3. The frequency of the external clock should be the same as that of the system
clock ( ).
Frequency (MHz)
R
C
S
0
(max) (pF)
(max) ( )
External Clock Input Method
(b) Example of external clock input when an inverted clock is input to XTAL pin
EXTAL
XTAL
EXTAL
XTAL
Figure 24.4 Example of External Clock Input
2
500
7
(a) Example of external clock input when XTAL pin left open
4
120
7
8
80
7
Open
10
70
7
Rev. 3.00 Mar 21, 2006 page 635 of 788
External clock input
External clock input
Section 24 Clock Pulse Generator
12
60
7
16
50
7
REJ09B0300-0300
20
40
7