DF2148RTE20IV Renesas Electronics America, DF2148RTE20IV Datasheet - Page 610

• 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
Bit 5—Keyboard Data In (KDI): Monitors the KDI I/O pin. This bit cannot be modified.
Bit 5
KDI
0
1
Bit 4—Keyboard Buffer Register Full Select (KBFSEL): Selects whether the KBF bit is used
as the keyboard buffer register full flag or as the KCLK fall interrupt flag, When KBFSEL is
cleared to 0, the KBE bit in the KBCRL register should be cleared to 0 to disable reception.
Bit 4
KBFSEL
0
1
Bit 3—Keyboard Interrupt Enable (KBIE): Enables or disables interrupts from the keyboard
buffer controller to the CPU.
Bit 3
KBIE
0
1
Bit 2—Keyboard Buffer Register Full (KBF): Indicates that data reception has been completed
and the received data is in the keyboard data buffer register (KBBR).
Bit 2
KBF
0
1
Rev. 4.00 Sep 27, 2006 page 564 of 1130
REJ09B0327-0400
Description
KD I/O pin is low
KD I/O pin is high
KBF bit is used as KCLK fall interrupt flag
KBF bit is used as keyboard buffer register full flag
Description
Interrupt requests are disabled
Interrupt requests are enabled
Description
[Clearing condition]
Read KBF when KBF =1, then write 0 in KBF
[Setting conditions]
Description
When data has been received normally and has been transferred to KBBR
(keyboard buffer register full flag)
When a KCLK falling edge is detected (while KBFSEL = 0) (KCLK interrupt flag)
(Initial value)
(Initial value)
(Initial value)
(Initial value)