HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 117

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

5.1
The multiprotocol serial communication interface (MSCI) supports three different communication
modes: asynchronous, byte synchronous, and bit synchronous.
The two full-duplex channels of the MSCIs, built in the SCA, have identical functions but operate
independently.
5.1.1
The MSCI features the following functions:
Functions of the MSCI in asynchronous, byte synchronous, and bit synchronous operating modes
can be summarized as follows:
Section 5 Multiprotocol Serial Communication Interface
Program-selectable operating modes: Asynchronous, byte synchronous, and bit synchronous
Transmission codes NRZ, NRZI, Manchester, FM0, and FM1 supported (only NRZ code
supported in asynchronous mode)
Full-duplex communications, auto echo, and local loop-back functions available
32-stage transmit and receive buffers provided
Modem control signals RTS, CTS, and DCD automatically controlled using the auto-enable
function
Programmable on-chip baud rate generator for transmission and reception
Selectable clock sources: External clock input, on-chip baud rate generator output, and
internal ADPLL (advanced digital PLL) output
Noise suppression function for receive clock and receive data
Data transmission rate of 50 bps to 7.1 Mbps for a 10-MHz system clock, and 50 bps to 12
Mbps for a 16.7-MHz system clock
Four interrupt signals: RXRDY, TXRDY, RXINT, and TXINT
Asynchronous Mode
RTS (request to send): General-purpose output/transmit request
CTS (clear to send): General-purpose input/transmit enable/transition-triggered interrupt
DCD (data carrier detect): General-purpose input/receive carrier detection/transition-
Programmable character length (5-8 bits/character) for transmission and reception
Programmable stop bit length (1, 1.5, or 2 bits)
triggered interrupt
Overview
Functions
(MSCI)
Rev. 0, 07/98, page 101 of 453