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S
SPICTL.0
SPI INT FLAG
SPI INT
ENA
SPISTS.6
S
Clock
Polarity
Talk
LSPCLK
456 123 0
0123
SPI Bit Rate
State Control
SPIRXBUF
Buffer Register
Clock
Phase
Receiver
Overrun Flag
SPICTL.4
Overrun
INT ENA
SPICCR.3 − 0
SPIBRR.6 − 0
SPICCR.6 SPICTL.3
SPIDAT.15 − 0
SPICTL.1
M
S
M
Master/Slave
SPISTS.7
SPIDAT
Data Register
M
S
SPICTL.2
SPI Char
SPISIMO
SPISOMI
SPICLK
SW2
S
M
M
S
SW3
To CPU
M
SW1
SPITXBUF
Buffer Register
RX FIFO _0
RX FIFO _1
−−−−−
RX FIFO _15
TX FIFO registers
TX FIFO _0
TX FIFO _1
−−−−−
TX FIFO _15
RX FIFO registers
16
16
16
TX Interrupt
Logic
RX Interrupt
Logic
SPIINT/SPIRXINT
SPITXINT
SPIFFOVF FLAG
SPIFFRX.15
16
TX FIFO Interrupt
RX FIFO Interrupt
SPIRXBUF
SPITXBUF
SPIFFTX.14
SPIFFENA
SPISTE
(A)
TMS320F2809, TMS320F2808, TMS320F2806
TMS320F2802, TMS320F2801, TMS320C2802
TMS320C2801, TMS320F28016, TMS320F28015
www.ti.com
SPRS230L–OCTOBER 2003–REVISED DECEMBER 2009
Figure 4-14 is a block diagram of the SPI in slave mode.
A. SPISTE is driven low by the master for a slave device.
Figure 4-14. SPI Module Block Diagram (Slave Mode)
Copyright © 2003–2009, Texas Instruments Incorporated Peripherals 79
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TMS320C2801 TMS320F28016 TMS320F28015