OM13006,598 NXP Semiconductors, OM13006,598 Datasheet - Page 130

• Manufacturer Part Number: OM13006,598
• Description: BOARD EVAL EM773 METER EU PLUG
• Manufacturer: NXP Semiconductors
• Type: Other Power Managementr

Specifications of OM13006,598

• 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: 568-6681

NXP Semiconductors
UM10415
User manual
10.11.6.2 Data transfer after loss of arbitration
10.11.6.3 Forced access to the I
Arbitration may be lost in the master transmitter and master receiver modes (see
Figure
0x78, and 0xB0 (see
If the STA flag in I2CON is set by the routines which service these states, then, if the bus
is free again, a START condition (state 0x08) is transmitted without intervention by the
CPU, and a retry of the total serial transfer can commence.
In some applications, it may be possible for an uncontrolled source to cause a bus
hang-up. In such situations, the problem may be caused by interference, temporary
interruption of the bus or a temporary short-circuit between SDA and SCL.
If an uncontrolled source generates a superfluous START or masks a STOP condition,
then the I
obtained within a reasonable amount of time, then a forced access to the I
possible. This is achieved by setting the STO flag while the STA flag is still set. No STOP
condition is transmitted. The I
and is able to transmit a START condition. The STO flag is cleared by hardware (see
Figure
08H
Fig 27. Simultaneous Repeated START conditions from two masters
Fig 28. Forced access to a busy I
S
21). Loss of arbitration is indicated by the following states in I2STAT; 0x38, 0x68,
28).
SLA
2
STO flag
SDA line
C-bus stays busy indefinitely. If the STA flag is set and bus access is not
STA flag
SCL line
W
All information provided in this document is subject to legal disclaimers.
18H
A
Rev. 1 — 10 September 2010
Figure 23
DATA
2
C-bus
2
C hardware behaves as if a STOP condition was received
time limit
and
repeated START earlier
other Master sends
28H
2
A
C-bus
Figure
S
24).
OTHER MASTER
CONTINUES
Chapter 10: EM773 I2C-bus interface
condition
start
retry
08H
P
UM10415
© NXP B.V. 2010. All rights reserved.
S
2
C-bus is
SLA
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