DS72030W200FPV Renesas Electronics America, DS72030W200FPV Datasheet - Page 798

Manufacturer Part Number

DS72030W200FPV

MPU, 32BIT, SH7203, ROMLESS, 240QFP

Manufacturer

Renesas Electronics America

Program Memory Size

Digital Ic Case Style

Supply Voltage Range

1.1V To 1.3V

Operating Temperature Range

-20Â°C To +85Â°C

Rohs Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Section 15 Serial Communication Interface with FIFO (SCIF)

In 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 SCIF are independent, so full duplex

communication is possible. The transmitter and receiver are 16-byte FIFO buffered, so data can be

written and read while transmitting and receiving are in progress, enabling continuous transmitting

and receiving.

Figure 15.2 shows the general format of asynchronous serial communication.

In asynchronous serial communication, the communication line is normally held in the mark

(high) state. The SCIF 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 asynchronous mode, the SCIF synchronizes at the falling edge of the start bit.

The SCIF samples each data bit on the eighth or fourth pulse of a clock with a frequency 16 or 8

times the bit rate. Receive data is latched at the center of each bit.

Rev. 3.00 Sep. 28, 2009 Page 766 of 1650

REJ09B0313-0300

Operation in Asynchronous Mode

Figure 15.2 Example of Data Format in Asynchronous Communication

(8-Bit Data with Parity and Two Stop Bits)

One unit of transfer data (character or frame)

Transmit/receive data

Idle state (mark state)