UPD77111 NEC, UPD77111 Datasheet - Page 64

• Manufacturer Part Number: UPD77111
• Description: 16-BIT FIXED-POINT DIGITAL SIGNAL PROCESSORS
• Manufacturer: NEC

64
PD77111, 77112
Caution If noise is superimposed on the serial clock, the serial interface may be deadlocked. Bear in
Make sure that the serial clock
rises and falls linearly.
mind the following points when designing your system:
• Reinforce the wiring for power supply and ground (if noise is superimposed on the power and
• Shorten the wiring between the device's SCK1 and SCK2 pins, and clock supply source.
• Do not cross the signal lines of the serial clock with any other signal lines. Do not route the
• Supply the clock to the SCK1 and SCK2 pins of the device from the clock source on a one-to-
• Exercise care that the serial clock does not overshoot or undershoot. In particular, make sure
ground lines, it has the same effect as if noise were superimposed on the serial clock).
serial clock line in the vicinity of a line through which a high alternating current flows.
one basis. Do not supply clock to several devices from one clock source.
that the rising and falling of the serial clock waveform are clear.
The serial clock must not bound. Noise
must not be superimposed on the serial clock.
Data Sheet U12801EJ4V0DS00
The serial clock must not rise or
fall step-wise.
PD77110, 77111, 77112