TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
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SPRS439I–JUNE 2007–REVISED MARCH 2011
Table 6-61. McBSP as SPI Master or Slave Timing Requirements (CLKSTP = 10b, CLKXP = 1)
MASTER
SLAVE
MIN MAX
NO.
UNIT
MIN
30
1
MAX
M49
M50
M51
M52
tsu(DRV-CKXH)
th(CKXH-DRV)
tsu(FXL-CKXL)
tc(CKX)
Setup time, DR valid before CLKX high
Hold time, DR valid after CLKX high
Setup time, FSX low before CLKX low
Cycle time, CLKX
8P – 10
ns
ns
ns
ns
8P – 10
8P + 10
16P
2P(1)
(1) 2P = 1/CLKG
Table 6-62. McBSP as SPI Master or Slave Switching Characteristics (CLKSTP = 10b, CLKXP = 1)
MASTER
SLAVE
MIN MAX
NO.
PARAMETER
UNIT
MIN
2P(1)
P
MAX
M43 th(CKXH-FXL)
M44 td(FXL-CKXL)
M47 tdis(FXH-DXHZ)
Hold time, FSX low after CLKX high
Delay time, FSX low to CLKX low
ns
ns
ns
Disable time, DX high impedance following last data bit from
FSX high
6
6P + 6
4P + 6
M48 td(FXL-DXV)
(1) 2P = 1/CLKG
Delay time, FSX low to DX valid
6
ns
For all SPI slave modes, CLKX must be a minimum of 8 CLKG cycles. Also, CLKG should be LSPCLK/2
by setting CLKSM = CLKGDV = 1. With maximum LSPCLK speed of 75 MHz, CLKX maximum frequency
will be LSPCLK/16; that is, 4.6875 MHz and P = 13.3 ns.
M52
M51
MSB
LSB
CLKX
FSX
M43
M44
M48
M47
DX
DR
Bit 0
Bit(n-1)
Bit(n-1)
(n-2)
M50
(n-3)
(n-4)
M49
Bit 0
(n-2)
(n-3)
(n-4)
Figure 6-39. McBSP Timing as SPI Master or Slave: CLKSTP = 10b, CLKXP = 1
Copyright © 2007–2011, Texas Instruments Incorporated
Electrical Specifications
179
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