OM13006,598 NXP Semiconductors, OM13006,598 Datasheet - Page 82

• 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
Fig 9.
UART1 Rx
UART1 Rx
UART1 Rx
FIFO read
FIFO level
RTS1 pin
Auto-RTS Functional Timing
9.6.8.1.2 Auto-CTS
start
N-1
byte N
Example: Suppose the UART operating in type ‘550 mode has the trigger level in U0FCR
set to 0x2, then, if Auto-RTS is enabled, the UART will deassert the RTS output as soon
as the receive FIFO contains 8 bytes
reasserted as soon as the receive FIFO hits the previous trigger level: 4 bytes.
The Auto-CTS function is enabled by setting the CTSen bit. If Auto-CTS is enabled, the
transmitter circuitry in the U0TSR module checks CTS input before sending the next data
byte. When CTS is active (low), the transmitter sends the next byte. To stop the
transmitter from sending the following byte, CTS must be released before the middle of
the last stop bit that is currently being sent. In Auto-CTS mode, a change of the CTS
signal does not trigger a modem status interrupt unless the CTS Interrupt Enable bit is set,
Delta CTS bit in the U0MSR will be set though.
generating a Modem Status interrupt.
Table 100. Modem status interrupt generation
The auto-CTS function reduces interrupts to the host system. When flow control is
enabled, a CTS state change does not trigger host interrupts because the device
automatically controls its own transmitter. Without Auto-CTS, the transmitter sends any
data present in the transmit FIFO and a receiver overrun error can result.
illustrates the Auto-CTS functional timing.
Enable
modem
status
interrupt
(U0ER[3])
0
1
1
1
1
1
1
1
1
stop
start
N
CTSen
(U0MCR[7])
x
0
0
0
1
1
1
1
1
All information provided in this document is subject to legal disclaimers.
bits0..7
N-1
Rev. 1 — 10 September 2010
Chapter 9: EM773 Universal Asynchronous Transmitter (UART)
CTS
interrupt
enable
(U0IER[7])
x
x
x
x
0
0
1
1
1
stop
N-2
N-1
(Table 97 on page
Delta CTS
(U0MSR[0])
x
0
1
x
x
x
0
1
x
N-2
Table 100
Delta DCD or trailing edge
RI or
Delta DSR (U0MSR[3] or
U0MSR[2] or U0MSR[1])
x
0
x
1
0
1
0
x
1
M+2
79). The RTS output will be
lists the conditions for
M+1
M
start
UM10415
© NXP B.V. 2010. All rights reserved.
Figure 10
bits0..7
M-1
Modem
status
interrupt
No
No
Yes
Yes
No
Yes
No
Yes
Yes
82 of 310
stop