Texas Instruments TMS320C3x - Manual (Page 409)

Serial Ports
12-30
Figure 12–21. Serial-Port Clocking in I/O Mode
TSTAT
Timer in
XSR
Timer in
XSR
Timer in
XSR
Timer in
XSR
TSTAT
TSTAT
TSTAT
DATIN
DATOUT
DATOUT (NC)
DATIN
DATAOUT
DATIN
DATOUT (NC)
DATIN
Internal
CLKX
CLKX
CLKX FUNC= 0 (I/O mode)
CLKX I/O
= 0 (CLKX, an input)
XCLK SRC = 1 (internal CLK for timer)
(c)
CLKX FUNC= 0 (I/O mode)
CLKX I/O
= 0 (CLKX, an input)
XCLK SRC = 0 (external CLK for timer)
(d)
CLKX FUNC= 0 (I/O mode)
CLKX I/O
= 1 (CLKX, an output)
XCLK SRC = 1 (internal CLK for timer)
CLKX FUNC= 0 (I/O mode)
CLKX I/O
= 1 (CLKX, an output)
XCLK SRC = 0 (external CLK for timer)
External
Internal External
Internal External
Internal External
Internal
clock
Internal
clock
(a) (b)
CLKX CLKX