DF2148RTE20IV Renesas Electronics America, DF2148RTE20IV Datasheet - Page 626

• Manufacturer Part Number: DF2148RTE20IV
• Description: MCU 5V 128K I-TEMP,PB-FREE, 100-
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148RTE20IV

• 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: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 17 Keyboard Buffer Controller
17.3.8
In this device, clearing the KBFSEL bit to 0 in KBCRH enables the KBF bit in KBCRL to be used
as a flag for the interrupt generated by the fall of KCLK input.
Figure 17.13 shows the setting method and an example of operation.
Rev. 4.00 Sep 27, 2006 page 580 of 1130
REJ09B0327-0400
Note: The KBF setting timing is the same as the timing of KBF setting and KCLK automatic I/O inhibit bit
(interrupt generated)
generation in figure 17.11. When the KBF bit is used as the KCLK input fall interrupt flag, the
automatic I/O inhibit function does not operate.
interrupts enabled)
(KCLK falling edge
Interrupt handling
KCLK Fall Interrupt Operation
(KBBR reception
fall detected?
KBFSEL = 0
Set KBIOE
Clear KBF
KCLK pin
disabled)
KBIE = 1
KBE = 0
KBF = 1
Figure 17.13 Example of KCLK Input Fall Interrupt Operation
Start
Yes
No
KCLK
(pin state)
KBF bit
Interrupt
generated
Cleared
by software
Interrupt
generated