dsp56857 Freescale Semiconductor, Inc, dsp56857 Datasheet - Page 41

• Manufacturer Part Number: dsp56857
• Description: Dsp56857 Digital Signal Controller
• Manufacturer: Freescale Semiconductor, Inc

4.11 Serial Communication Interface (SCI) Timing
Freescale Semiconductor
Operating Conditions: V
Baud Rate
RXD
TXD
1. f
2. The RXD pin in SCI0 is named RXD0 and the RXD pin in SCI1 is named RXD1.
3. The TXD pin in SCI0 is named TXD0 and the TXD pin in SCI1 is named TXD1.
4. Parameters listed are guaranteed by design.
SC2 (wl) input
SC1 (wl) input
SC2 (bl) input
SC1 (bl) input
3
2
MAX
Pulse Width
Pulse Width
SCK input
SC0 input
is the frequency of operation of the system clock in MHz.
1
SRD
STD
Characteristic
SS
= V
t
SSIO
FTXES
t
t
TXES
SCKH
t
t
t
RFSWHS
TXVS
RFSBHS
= V
t
t
TFSWHS
SS
Figure 4-27 Slave Mode Clock Timing
t
SSA
TFSBHS
t
SCKW
= 0 V, V
t
FTXVS
t
SCKL
Table 4-13 SCI Timing
DD
56857 Technical Data, Rev. 6
First Bit
t
HS
= 1.62-1.98V, V
Symbol
RXD
TXD
BR
t
TFSBLS
PW
PW
t
t
RFBLS
TXNVS
t
TSS
DDIO
= V
DDA
0.965/BR
0.965/BR
t
THS
Min
= 3.0–3.6V, T
—
4
A
= –40° to +120°C, C
Serial Communication Interface (SCI) Timing
(f
MAX
1.04/BR
1.04/BR
Last Bit
Max
)/(32)
L
≤ 50pF, f
t
t
TFSWLS
RFSWLS
op
t
TXHIS
Mbps
= 120MHz
Unit
ns
ns
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