TMS370CX2X Datasheet, PDF (29/60 Pages) Texas Instruments – 8-BIT MICROCONTROLLER

serial peripheral interface (continued)
The SPI block diagram is listed in Figure 11.
SPIBUF.7-0
SPIBUF Buffer
Register
RECEIVER
OVERRUN
SPICTL.7
8
SPI INT FLAG
SPICTL.0
SPICTL.6
SPIINT ENA
TMS370Cx2x
8-BIT MICROCONTROLLER
SPNS018C – FEBRUARY 1993 – REVISED FEBRUARY 1997
SPIPRI.6
0
Level 1 INT
1 _{Level 2 INT}
SPIDAT
Data Register
SPIDAT.7-0
State Control
SPICTL.1
TALK
SPIPC2.7-4
SPISIMO
SPIPC2.3-0
SPISOMI
SPI CHAR
System
Clock
SPICCR.2-0
2 10
SPICCR.5-3
543
SPI BIT RATE
† _{The diagram shows slave mode.}
MASTER/SLAVE†
SPICTL.2
SPICCR.6
SPIPC1.3-0
SPICLK
CLOCK POLARITY
Figure 11. SPI Block Diagram
serial communications interface 1 (SCI1)
The TMS370x2x devices include a serial communications interface 1 (SCI1) module. The SCI1 module
supports digital communications between the TMS370 devices and other asynchronous peripherals, and uses
the standard non-return-to-zero (NRZ) format. The SCI1’s receiver and transmitter are double buffered, and
each has separate enable and interrupt bits. Both can operate independently or simultaneously in the full-duplex
mode. To ensure data integrity, the SCI1 checks received data for break detection, parity, overrun, and framing
errors. The bit rate (baud) is programmable to over 65,000 speeds through a 16-bit baud-select register.
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