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14 uaRT
S1C17153 TeChniCal Manual
Seiko epson Corporation
14-1
(Rev. 1.0)
UART
14
uaRT Module Overview
14.1
The S1C17153 includes a UART module for asynchronous communication. It includes a 2-byte receive data buffer
and 1-byte transmit data buffer allowing successive data transfer. The UART module also includes an RZI modula-
tor/demodulator circuit that enables IrDA 1.0-compatible infrared communications simply by adding basic external
circuits.
The following shows the main features of the UART:
• Number of channels: 1 channel
• Transfer rate:
150 to 230,400 bps (150 to 115,200 bps in IrDA mode)
• Transfer clock:
Internal clock (baud rate generator output) or an external clock (SCLK input) can be se-
lected.
• Character length:
7 or 8 bits (LSB first)
• Parity mode:
Even, odd, or no parity
• Stop bit:
1 or 2 bits
• Start bit:
1 bit fixed
• Supports full-duplex communications.
• Includes a 2-byte receive data buffer and a 1-byte transmit data buffer.
• Includes a baud rate generator with fine adjustment function.
• Includes an RZI modulator/demodulator circuit to support IrDA 1.0-compatible infrared communications.
• Can detect parity error, framing error, and overrun error during receiving.
• Can generate receive buffer full, transmit buffer empty, end of transmission and receive error interrupts.
Figure 14.1.1 shows the UART configuration.
Shift register
Receive data
buffer (2 bytes)
SIN
x
Internal bus
ITC
UART Ch.
x
Bus I/F
and
control
registers
SCLK
x
Shift register
Transmit data
buffer (1 byte)
Clock/transfer control
SOUT
x
RZI
demodulator
RZI
modulator
Interrupt
control
sclk
Baud rate
generator
1.1 UART Configuration
Figure 14.
note
: The letter ‘
x
’ in register and pin names refers to a channel number (0).
Example: UART_CTL
x
register
Ch.0: UART_CTL0 register