TMS370CX2XFN datasheet(51/60 Pages) TI

51 / 60 page

TMS370Cx2x

8-BIT MICROCONTROLLER

SPNS018C – FEBRUARY 1993 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

SCI1 isosynchronous† mode timing characteristics and requirements for internal clock

(see Note 12 and Figure 26)

NO.

MIN

MAX

UNIT

tc(SCC)

Cycle time, SCICLK

2tc

131 072tc

tw(SCCL)

Pulse duration, SCICLK low

tc – 45

0.5tc(SCC)+45

tw(SCCH)

Pulse duration, SCICLK high

tc – 45

0.5tc(SCC)+45

td(SCCL-TXDV)

Delay time, SCITXD valid after SCICLK low

– 50

tv(SCCH-TXD)

Valid time, SCITXD data valid after SCICLK high

tw(SCCH) – 50

tsu(RXD-SCCH)

Setup time, SCIRXD to SCICLK high

0.25 tc + 145

tv(SCCH-RXD)

Valid time, SCIRXD data valid after SCICLK high

NOTE 12

: tc = system-clock cycle time = 1 /SYSCLK

SCIRXD

SCITXD

SCICLK

Data Valid

Figure 26. SCI1 Isosynchronous Mode Timing for Internal Clock

† Isosynchronous = Isochronous

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