p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 353

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

This LSI has two independent serial communication interface (SCI) channels. The SCI can handle
both asynchronous and clocked synchronous serial communication. Asynchronous serial data
communication can be carried out with standard asynchronous communication chips such as a
Universal Asynchronous Receiver/Transmitter (UART) or Asynchronous Communication
Interface Adapter (ACIA). A function is also provided for serial communication between
processors (multiprocessor communication function) in asynchronous mode.
15.1
• Choice of asynchronous or clocked synchronous serial communication mode
• Full-duplex communication capability
• The on-chip baud rate generator allows any bit rate to be selected
• Choice of LSB-first or MSB-first transfer (except in the case of asynchronous mode 7-bit data)
• Four interrupt sources
Asynchronous Mode:
• Data length: 7 or 8 bits
• Stop bit length: 1 or 2 bits
• Parity: Even, odd, or none
• Receive error detection: Parity, overrun, and framing errors
• Break detection: Break can be detected by reading the RxD pin level directly in case of a
SCI0022B_000020020700
The transmitter and receiver are mutually independent, enabling transmission and reception to
be executed simultaneously. Double-buffering is used in both the transmitter and the receiver,
enabling continuous transmission and continuous reception of serial data.
An external clock can be selected as a transfer clock source.
Four interrupt sources — transmit-end, transmit-data-empty, receive-data-full, and receive
error — that can issue requests.
The transmit-data-empty and receive-data-full interrupt sources can activate the DTC.
framing error
Section 15 Serial Communication Interface (SCI)
Features
Section 15 Serial Communication Interface (SCI)
Rev. 1.00 Sep. 21, 2006 Page 315 of 658
REJ09B0310-0100