TMS77C82 datasheet(39/77 Pages) TI

39 / 77 page

TMS370Cx5x

8-BIT MICROCONTROLLER

SPNS010F – DECEMBER 1986 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

serial communications interface 1 (SCI1) module (continued)

Features of the SCI1 module include:

D Three external pins:

–

SCITXD: SCI transmit output pin or general-purpose bidirectional I/O pin

–

SCIRXD: SCI receive input pin or general-purpose bidirectional I/O pin

–

SCICLK: SCI bidirectional serial clock pin, or general-purpose bidirectional I/O pin

D Two communications modes: asynchronous and isosynchronous†

D Baud rate: 64K different programmable rates

–

Asynchronous mode: 3 bps to 156K bps at 5-MHz SYSCLK

ASYNCHRONOUS BAUD

SYSCLK

(BAUD REG

) 1)

–

Isosynchronous mode: 39 bps to 2.5M bps at 5-MHz SYSCLK

ISOSYNCHRONOUS BAUD

SYSCLK

(BAUD REG

) 1)

D Data-word format

–

One start bit

–

Data-word length programmable from 1 to 8 bits

–

Optional even/odd/no parity bit

–

One or two stop bits

D Four error-detection flags: parity, overrun, framing, and break detection

D Two wake-up multiprocessor modes: Idle-line and address bit

D Half or full-duplex operation

D Double-buffered receive and transmit functions

D Interrupt driven or polled algorithms with status flags accomplish transmitter (TX) and receiver (RX)

operations.

–

Transmitter: TXRDY flag (transmitter buffer register is ready to receive another character) and TX

EMPTY flag (transmitter shift register is empty)

–

Receiver: RXRDY flag (receive buffer register ready to receive another character), BRKDT flag (break

condition occurred), and RX ERROR monitoring four interrupt conditions

–

Separate enable bits for transmitter and receiver interrupts

–

NRZ (non return-to-zero) format

D Eleven SCI1 module control registers are located in control register frame beginning at address P050h.

† Isosynchronous = Isochronous

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