HD64F2149 Datasheet, PDF (444/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

• Full-duplex communication capability
 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
• LSB-first or MSB-first transfer can be selected
 This selection can be made regardless of the communication mode (with the exception of 7-
bit data transfer in asynchronous mode)*
Note: * LSB-first transfer is used in the examples in this section.
• Built-in baud rate generator allows any bit rate to be selected
• Choice of serial clock source: internal clock from baud rate generator or external clock from
SCK pin
• Capability of transmit and receive clock output
 The P86/SCK and P42/SCK2 pins are CMOS type outputs
 The P52/SCK0 pin is an NMOS push-pull type output (When using the P52/SCK pin as an
output, an external pull-up resistor must be connected in order to output high level)
• Four interrupt sources
 Four interrupt sources (transmit-data-empty, transmit-end, receive-data-full, and receive
error) that can issue requests independently
 The transmit-data-empty interrupt and receive-data-full interrupt can activate the data
transfer controller (DTC) to execute data transfer
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