TMS370CX4X Datasheet, PDF (55/66 Pages) Texas Instruments – 8-BIT MICROCONTROLLER

TMS370Cx4x
8-BIT MICROCONTROLLER
SPNS016C – NOVEMBER 1992 – REVISED FEBRUARY 1997
SERIAL COMMUNICATIONS INTERFACE 1 (SCI1) INTERNAL CLOCK
ISOSYNCHRONOUS MODE I/O TIMING
SCI1 isosynchronous mode timing characteristics and requirements for internal clock
(see Note 10 and Figure 21)
NO.
PARAMETER
24 tc(SCC)
Cycle time, SCICLK
25 tw(SCCL)
Pulse duration, SCICLK low
26 tw(SCCH)
Pulse duration, SCICLK high
27 td(SCCL-TXDV) Delay time, SCITXD valid after SCICLK low
28 tv(SCCH-TXD) Valid time, SCITXD data after SCICLK high
29 tsu(RXD-SCCH) Setup time, SCIRXD to SCICLK high
30 tv(SCCH-RXD) Valid time, SCIRXD data after SCICLK high
NOTE 10: tc = system-clock cycle time = 1/SYSCLK.
24
MIN
2tc
tc – 45
tc – 45
– 50
tw(SCCH) – 50
0.25tc + 145
0
MAX
131,072tc
0.5tc(SCC)+45
0.5tc(SCC)+45
60
UNIT
ns
ns
ns
ns
ns
ns
ns
SCICLK
26
25
SCITXD
27
28
Data Valid
SCIRXD
29
30
Data Valid
Figure 21. SCI1 Isosynchronous Mode Timing Diagram for Internal Clock
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