UCD3138128APFC datasheet(44/83 Pages) TI1

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tCSS

tWH

tWL

tCSH

tSU

VALID IN

VALID OUT

SCS

SCK

MISO

MOSI

tHO

PSCK

Period SCK

2 ICLK

tWH

SCK High Time

1/2 PSCK

tWL

SCK Low Time

1/2 PSCK

tSU

Data in setup

2 ns (typical)

Data in hold

4 ns (typical)

Ouput Valid

4 ns (typical)

tHO

Ouput Data Hold

2 ns (typical)

tCSS

Chip Select Setup

1 PSCK

tCSH

Chip Select Hold

1 PSCK

UCD3138128A

SLUSC99 – JULY 2016

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Figure 31. SPI Timing Diagram

9.3.7.4 JTAG Standard Interface

The UCD31xx family provides an On-Chip Scan-Base Emulation Logic, IEEE standard 1149.1 JTAG interface

which requires four signals for debugging and flash programming purposes. The JTAG pins are shared with other

function specific or general purpose I/O. The IOMUX register controls the JTAG pin sharing mechanism. The Pin

Functions table in Pin Configuration and Functions lists the JTAG pin requirements. For further details on

interfacing to development tools and device programmers, see the UCD31xx Technical reference Manual

(SLUSAP2).

9.3.8 Real Time Clock

The UCD3138xA has an internal real time clock (RTC) function that can track time in seconds, minutes, hours

and days. This function requires an external precision 10 MHz clock.

•

Firmware writable time/day register which tracks the total number of days.

–

The day counter will be able to count 4 years worth of days.

–

Years and months and leap year calculation must be calculated in firmware.

•

Firmware programmable frequency correction of ±200 ppm in 0.8 ppm steps

•

The RTC function can provide interrupts to the IRQ or FIQ at 1, 10, 30, and 60 second intervals.

•

The clock from the RTC driver can be driven to an external pin through an internal multiplexor

•

The clock for the RTC function can come from an external clock through a dedicated GPIO pin.

9.3.9 External Crystal Interface

The UCD3138128A supports a 10-MHz external crystal. The external crystal can be used for the Real Time

Clock or synthesized to be the system clock.

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