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SCI Programming Model
and the external clock is used if the SCI is the slave device, as noted above. The clock is gated
and limited to a maximum frequency equal to one eighth of the DSP core operating frequency
(that is, 12.5 MHz for a DSP core frequency of 100 MHz).
For asynchronous operation, the SCI can use the internal and external clocks in any combination
as the source clocks for the TX clock and RX clock. If an external clock is used for the SCLK
input, it must be sixteen times the desired bit rate (designated as the 16 × clock), as indicated in
Figure 8-6 . When the internal clock is used to supply a clock to an external device, the clock can
use the actual bit rate (designated as the 1 × clock) or the 16 × clock rate, as determined by the
COD bit. The output clock is continuous.
Select 8-or 9-bit Words
Idle Line
0
1
2
3
4
5
6
7
8
RX, TX Data
(SSFTD = 0)
Start
Stop
Start
x1 Clock
x16 Clock
(SCKP = 0)
Figure 8-6. 16 x Serial Clock
When SCKP is cleared, the transmitted data on the TXD signal changes on the negative edge of
the serial clock and is stable on the positive edge. When SCKP is set, the data changes on the
positive edge and is stable on the negative edge. The received data on the RXD signal is sampled
on the positive edge (if SCKP = 0) or on the negative edge (if SCKP = 1) of the serial clock.
8.6.4 SCI Data Registers
The SCI data registers are divided into two groups: receive and transmit, as shown in Figure 8-7 .
There are two receive registers: a Receive Data Register (SRX) and a serial-to-parallel Receive
Shift Register. There are also two transmit registers: a Transmit Data Register (called either STX
or STXA) and a parallel-to-serial Transmit Shift Register.
DSP56311 User’s Manual, Rev. 2
Freescale Semiconductor
8-19
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