DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 616

• 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

Section 17 Keyboard Buffer Controller
17.3.2
In a transmit operation, KCLK (clock) is an output on the keyboard side, and KD (data) is an
output on the H8S/2148 Group and H8S/2147N chip (system) side. KD outputs a start bit, 8 data
bits (LSB-first), an odd parity bit, and a stop bit, in that order. The KD value is valid when KCLK
is high. A sample transmit processing flowchart is shown in figure 17.5, and the transmit timing in
figure 17.6.
Rev. 4.00 Sep 27, 2006 page 570 of 1130
REJ09B0327-0400
KCLK
(pin state)
KD
(pin state)
KCLK
(input)
KCLK
(output)
KB7 to KB0
PER
KBS
KBF
Transmit Operation
[1] [2] [3]
Previous data
Start
bit
1
0
2
KB0
Figure 17.4 Receive Timing
1
3
KB1
7
9
Parity bit
10
Receive data
Stop bit
[4] [5]
11
Automatic I/O inhibit
Receive processing/
error handling
Flag cleared
[6]