OM13005,598 NXP Semiconductors, OM13005,598 Datasheet - Page 81

• 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
9.6.8.1.1 Auto-RTS
9.6.8.1 Auto-flow control
Table 99.
If auto-RTS mode is enabled the UART‘s receiver FIFO hardware controls the RTS output
of the UART. If the auto-CTS mode is enabled the UART‘s U0TSR hardware will only start
transmitting if the CTS input signal is asserted.
The auto-RTS function is enabled by setting the RTSen bit. Auto-RTS data flow control
originates in the U0RBR module and is linked to the programmed receiver FIFO trigger
level. If auto-RTS is enabled, the data-flow is controlled as follows:
When the receiver FIFO level reaches the programmed trigger level, RTS is deasserted
(to a high value). It is possible that the sending UART sends an additional byte after the
trigger level is reached (assuming the sending UART has another byte to send) because it
might not recognize the deassertion of RTS until after it has begun sending the additional
byte. RTS is automatically reasserted (to a low value) once the receiver FIFO has reached
the previous trigger level. The reassertion of RTS signals the sending UART to continue
transmitting data.
If Auto-RTS mode is disabled, the RTSen bit controls the RTS output of the UART. If
Auto-RTS mode is enabled, hardware controls the RTS output, and the actual value of
RTS will be copied in the RTS Control bit of the UART. As long as Auto-RTS is enabled,
the value of the RTS Control bit is read-only for software.
Bit
4
5
6
7
31:8 -
Symbol
Loopback
Mode
Select
-
RTSen
CTSen
UART0 Modem Control Register (U0MCR - address 0x4000 8010) bit description
All information provided in this document is subject to legal disclaimers.
Value Description
0
1
NA
0
1
0
1
-
Rev. 1 — 10 September 2010
Chapter 9: EM773 Universal Asynchronous Transmitter (UART)
The modem loopback mode provides a mechanism to perform
diagnostic loopback testing. Serial data from the transmitter is
connected internally to serial input of the receiver. Input pin, RXD,
has no effect on loopback and output pin, TXD is held in marking
state. The four modem inputs (CTS, DSR, RI and DCD) are
disconnected externally. Externally, the modem outputs (RTS,
DTR) are set inactive. Internally, the four modem outputs are
connected to the four modem inputs. As a result of these
connections, the upper four bits of the U0MSR will be driven by
the lower four bits of the U0MCR rather than the four modem
inputs in normal mode. This permits modem status interrupts to
be generated in loopback mode by writing the lower four bits of
U0MCR.
Disable modem loopback mode.
Enable modem loopback mode.
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
Disable auto-rts flow control.
Enable auto-rts flow control.
Disable auto-cts flow control.
Enable auto-cts flow control.
Reserved
UM10415
© NXP B.V. 2010. All rights reserved.
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Reset
value
0
0
0
0
-