XR17V352IB-0A-EVB Exar Corporation, XR17V352IB-0A-EVB Datasheet - Page 21

• Manufacturer Part Number: XR17V352IB-0A-EVB
• Description: EVAL BOARD FOR XR17V352 113BGA
• Manufacturer: Exar Corporation

Specifications of XR17V352IB-0A-EVB

• Main Purpose: Interface, UART
• Embedded: -
• Utilized Ic / Part: XR17V352
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

REV. 1.0.1
Timer Interrupt
In the one-shot mode, the Timer will issue an interrupt upon timing out which is ’N’ clocks after the Timer is
started. In the re-triggerable mode, the Timer will keep issuing an interrupt every ’N’ clocks which is on every
rising edge of the Timer output. The Timer interrupt can be cleared by reading the TIMERCNTL register or
when a Timer Reset command is issued which brings the Timer back to its default settings. The TIMERCNTL
will read a value of 0x01 when the Timer interrupt is enabled and there is a pending interrupt. It reads a value
of 0x00 at all other times. Stopping the Timer does not clear the interrupt and neither does subsequent re-
starting.
Each bit selects 8X or 16X sampling rate for that UART channel. The 8XMODE register is accessible from the
Device Configuration Registers in all UART channels but the UART channel can only control the bit for that
channel. For example, bit [0] is for channel 0 and can only be controlled by channel 0. All other bits are read-
only in channel 0. Logic 0 (default) selects normal 16X sampling (and 4XMODE = 0x00) with logic one selects
F
F
1.4.3
IGURE
IGURE
Re-triggerable
One-shot Mode
TIMER Output in
TIMER Output in
One-Shot Mode
Re-triggerable
Mode
6. T
7. I
Mode
8XMODE [7:0] (default 0x00)
NTERRUPT
IMER
O
UTPUT IN
O
COMMAND ISSUED
UTPUT
START TIMER
Timer Started
< 'N' Clocks
O
NE
(
ACTIVE
After 'P'
clocks
-S
HOT AND
START TIMER COMMANDS ISSUED: LESS THAN 'N'
After 'Q'
CLOCKS BETWEEN SUCCESSIVE COMMANDS
clocks
LOW)
R
After 'P'
clocks
IN
E
-
TRIGGERABLE
O
NE
Timer Timed
After 'Q'
clocks
-S
Out
21
HOT AND
HIGH PERFORMANCE DUAL PCI EXPRESS UART
After 'P'
clocks
M
< 'N' Clocks
ODES
R
COMMAND ISSUED
After 'Q'
clocks
TIMERCNTL
E
START TIMER
-
TRIGGERABLE
read
After 'P'
clocks
'N' Clocks
Timer Timed
Out
After 'Q'
clocks
M
ODES
TIMERCNTL
After 'P'
clocks
COMMAND ISSUED
STOP TIMER
read
XR17V352
Timer Timed
Out