DF2505BR26DV Renesas Electronics America, DF2505BR26DV Datasheet - Page 473

• Manufacturer Part Number: DF2505BR26DV
• Description: IC H8S/2505 MCU FLASH 176-LFBGA
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2500r

Specifications of DF2505BR26DV

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 26MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 104
• Program Memory Size: 384KB (384K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 176-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

13.4
Figure 13.2 shows the general format for asynchronous serial communication. One frame consists
of a start bit (low level), followed by data, a parity bit, and finally stop bits (high level). In
asynchronous serial communication, the transmission line is usually held in the mark state (high
level). The SCI monitors the transmission line, and when it goes to the space state (low level),
recognizes a start bit and starts serial communication. Inside the SCI, the transmitter and receiver
are independent units, enabling full-duplex communication. Both the transmitter and the receiver
also have a double-buffered structure, so that data can be read or written during transmission or
reception, enabling continuous data transfer. In asynchronous mode, the SCI performs
synchronization at the falling edge of the start bit in reception. The SCI samples the data on the
8th pulse of a clock with a frequency of 16 times the length of one bit, so that the transfer data is
latched at the center of each bit.
13.4.1
Table 13.10 shows the data transfer formats that can be used in asynchronous mode. Any of 12
transfer formats can be selected according to the SMR setting. For details on the multiprocessor
bit, see section 13.5, Multiprocessor Communication Function.
Serial
data
Operation in Asynchronous Mode
Data Transfer Format
1
Start
bit
1 bit
0
Figure 13.2 Data Format in Asynchronous Communication
LSB
D0
(Example with 8-Bit Data, Parity, Two Stop Bits)
One unit of transfer data (character or frame)
D1
D2
Transmit/receive data
D3
7 or 8 bits
D4
D5
D6
Section 13 Serial Communication Interface (SCI)
MSB
D7
Rev. 6.00 Sep. 24, 2009 Page 425 of 928
Parity
bit
1 bit,
or none
0/1
1
Stop bit
1 or
2 bits
1
Idle state
(mark state)
REJ09B0099-0600
1