OM13005,598 NXP Semiconductors, OM13005,598 Datasheet - Page 153

• Manufacturer Part Number: OM13005,598
• Description: BOARD EVAL EM773 METER US PLUG
• Manufacturer: NXP Semiconductors
• Type: Other Power Managementr

Specifications of OM13005,598

• Design Resources: Plug Meter Schematics, Gerber Files USB Dongle Schematics, Gerber Files
• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 32-Bit
• Utilized Ic / Part: EM773FHN33,551
• Interface Type: USB
• Maximum Operating Temperature: + 150 C
• Operating Supply Voltage: 1.8 V to 3.6 V
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: EM773, OL2381
• Other names: 568-6680

NXP Semiconductors
UM10415
User manual
11.8.3 Semiconductor Microwire frame format
After all bits have been transferred, in the case of a single word transmission, the SSEL
line is returned to its idle HIGH state one SCK period after the last bit has been captured.
For continuous back-to-back transmissions, the SSEL pins remains in its active LOW
state, until the final bit of the last word has been captured, and then returns to its idle state
as described above. In general, for continuous back-to-back transfers the SSEL pin is
held LOW between successive data words and termination is the same as that of the
single word transfer.
Figure 35
format when back-to-back frames are transmitted.
Microwire format is very similar to SPI format, except that transmission is half-duplex
instead of full-duplex, using a master-slave message passing technique. Each serial
transmission begins with an 8-bit control word that is transmitted from the SPI/SSP to the
off-chip slave device. During this transmission, no incoming data is received by the
SPI/SSP. After the message has been sent, the off-chip slave decodes it and, after waiting
one serial clock after the last bit of the 8-bit control message has been sent, responds with
the required data. The returned data is 4 to 16 bit in length, making the total frame length
anywhere from 13 to 25 bits.
In this configuration, during idle periods:
Fig 35. Microwire frame format (single transfer)
Fig 36. Microwire frame format (continuos transfers)
•
•
•
The SK signal is forced LOW.
CS is forced HIGH.
The transmit data line SO is arbitrarily forced LOW.
CS
SO
SK
shows the Microwire frame format for a single frame.
SI
CS
SO
SK
SI
All information provided in this document is subject to legal disclaimers.
LSB
MSB
0
Rev. 1 — 10 September 2010
MSB
of output data
4 to 16 bits
8-bit control
LSB
MSB
LSB
8-bit control
0
MSB
of output data
4 to 16 bits
Chapter 11: EM773 SPI0 with SSP
LSB
LSB
Figure 36
MSB
of output data
4 to 16 bits
UM10415
© NXP B.V. 2010. All rights reserved.
shows the same
LSB
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