HD6417727F160V Renesas Electronics America, HD6417727F160V Datasheet - Page 569

• Manufacturer Part Number: HD6417727F160V
• Description: MPU 3V 16K PB-FREE 240-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417727F160V

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 160MHz
• Connectivity: FIFO, SCI, SIO, SmartCard, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 104
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.7 V ~ 2.05 V
• Data Converters: A/D 6x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 240-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Section 17 Serial Communication Interface (SCI)
17.3.2
Operation in Asynchronous Mode
In the asynchronous mode, each transmitted or received character begins with a start bit and ends
with a stop bit. Serial communication is synchronized one character at a time.
The transmitting and receiving sections of the SCI are independent, so full duplex communication
is possible. The transmitter and receiver are both double buffered, so data can be written and read
while transmitting and receiving are in progress, enabling continuous transmitting and receiving.
Figure 17.5 shows the general format of asynchronous serial communication. In asynchronous
serial communication, the communication line is normally held in the mark (high) state. The SCI
monitors the line and starts serial communication when the line goes to the space (low) state,
indicating a start bit. One serial character consists of a start bit (low), data (LSB first), parity bit
(high or low), and stop bit (high), in that order.
When receiving in the asynchronous mode, the SCI synchronizes on the falling edge of the start
bit. The SCI samples each data bit on the eighth pulse of a clock with a frequency 16 times the bit
rate. Receive data is latched at the center of each bit.
Idling (marking)
1
(LSB)
(MSB)
1
Serial
0
D
D
D
D
D
D
D
D
0/1
1
1
0
1
2
3
4
5
6
7
data
Start
Parity
Stop
bit
bit
bit
Transmit/receive data
7 or 8 bits
1 bit
1 or
1 or
no bit
2 bits
One unit of communication data (character or frame)
Figure 17.5 Data Format in Asynchronous Communication
(Example with 8-Bit Data, Parity, Two Stop Bits)
Transmit/Receive Formats
Table 17.11 lists the 12 communication formats that can be selected in the asynchronous mode.
The format is selected by settings in the serial mode register (SCSMR).
Rev.6.00 Mar. 27, 2009 Page 511 of 1036
REJ09B0254-0600