dsp56854 Freescale Semiconductor, Inc, dsp56854 Datasheet - Page 48

• Manufacturer Part Number: dsp56854
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

4.12 Serial Communication Interface (SCI) Timing
48
Operating Conditions: V
Baud Rate
RXD
TXD
SC2 (wl) input
SC1 (wl) input
SC2 (bl) input
SC1 (bl) input
1.
2.
3.
4.
3
2
SCK input
SC0 input
Pulse Width
Pulse Width
f
The RXD pin in SCI0 is named RXD0 and the RXD pin in SCI1 is named RXD1.
The TXD pin in SCI0 is named TXD0 and the TXD pin in SCI1 is named TXD1.
Parameters listed are guaranteed by design.
MAX
1
SRD
STD
is the frequency of operation of the system clock in MHz.
Characteristic
SS
= V
t
FTXES
SSIO
t
t
TXES
SCKH
t
t
t
RFSWHS
TXVS
RFSBHS
t
= V
t
TFSWHS
SS
t
TFSBHS
t
Figure 4-30 Slave Mode Clock Timing
SSA
SCKW
= 0 V, V
t
FTXVS
t
SCKL
Table 4-13 SCI Timing
DD
First Bit
t
56854 Technical Data, Rev. 6
HS
= 1.62-1.98V, V
Symbol
RXD
TXD
BR
t
TFSBLS
t
t
RFBLS
PW
TXNVS
PW
t
TSS
DDIO
= V
DDA
t
0.965/BR
0.965/BR
THS
Min
= 3.0–3.6V, T
—
4
A
= –40° to +120°C, C
(f
1.04/BR
1.04/BR
MAX
Last Bit
Max
)/(32)
Freescale Semiconductor
L
≤ 50pF, f
t
t
TFSWLS
RFSWLS
t
TXHIS
op
Mbps
= 120MHz
Unit
ns
ns