Epson S1C33L03 User Manual

The Peripheral Block contains four channels (Ch.0, Ch.1, Ch.2 and Ch.3) of serial interfaces, the features of which

are described below. The functions of these four serial interfaces are the same.

• A  clock-synchronized or asynchronous mode can be selected for the transfer method.

Clock-synchronized mode

Data length:

8 bits, fixed (No start, stop, and parity bits)

Receive error: An overrun error can been detected.

Asynchronous mode

Data length:

7 or 8 bits, selectable

Receive error: Overrun, framing, or parity errors can been detected.

Start bit:

1 bit, fixed

Stop bit:

1 or 2 bits, selectable

Parity bit:

Even, odd, or none; selectable

Since the transmit and receive units are independent, full-duplex communication is possible.

• Baud-rate  setting:

Any desired baud rate can be set by selecting the prescaler's division ratio, setting the 8-bit

programmable timer, or using external clock input (asynchronous mode only).

• The  receive  and transmit units are constructed with a double-buffer structure, allowing for successive receive and

transmit operations.

• Data  transfers using IDMA or HSDMA are possible.

• Three  types of interrupts (transmit data empty, receive data full, and receive error) can be generated.

Figure 8.1 shows the configuration of the serial interface (one channel).

Control registers

Transmit unit

Data buffer

and

shift register

Interrupt

control circuit

Start bit

detection circuit

Clock

control circuit

Transmit data buffer empty
interrupt request

Receive data buffer full
interrupt request

Receive error
interrupt request

SOUTx

#SCLKx

#SRDYx

SINx

Internal data bus

Receive unit

Data buffer

and

shift register

Serial output

control circuit

Serial input

control circuit

Ready signal

control circuit

8-bit programmable timer output

Figure 8.1  Configuration of Serial Interface

Note: Ch.0 to Ch.3 have the same configuration and the same function. The signal and control bit

names are suffixed by a 0, 1, 2, or 3 to indicate the channel number, enabling discrimination
between channels 0 to 3. In this manual, however, channel numbers 0 to 3 are replaced with "x"
unless discrimination is necessary, because explanations are common to all four channels.