XR16V794IV-F Exar Corporation, XR16V794IV-F Datasheet - Page 23

• Manufacturer Part Number: XR16V794IV-F
• Description: 3.3V HIGH PERFORMANCE QUAD UART
• Manufacturer: Exar Corporation

Specifications of XR16V794IV-F

• Features: *
• Number Of Channels: 4, QUART
• Fifo's: 64 Byte
• Protocol: RS485
• Voltage - Supply: 2.25 V ~ 3.6 V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. 1.0.1
TIMER OPERATION
The following paragraphs describe the operation of the 16-bit Timer/Counter. The following conventions will be
used in this discussion:
Timer Interrupt
In the one-shot mode, the Timer will issue an interrupt ’N’ clocks after the Timer is started. This is the time
when the Timer times-out in the one-shot mode. In the re-triggerable mode, the Timer will keep issuing an
interrupt every ’N’ clocks. This is shown in
triggereble mode) is ’N’ clocks. The Timer interrupt can be cleared by reading the TIMERCNTL register. The
TIMERCNTL will read a value of 0x01 when there is an interrupt and a 0x00 at all other times.
F
IGURE
Re-triggerable
One-shot Mode
■
■
F
’N’ is the 16-bit value programmed in the TIMER MSB, LSB registers
‘N’ can take any value from 0x0002 to 0xFFFF.
Mode
IGURE
15. I
COMMANDS
TIMERCNTL
NTERRUPT
14. T
TIMERMSB and TIMERLSB
OSC. CLOCK
IMER
HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL BAUD RATE
(16-bit Value)
TMRCK
O
/C
Clock Select
Start/Stop
Single shot/Re-triggerable
UTPUT IN
Timer Interrupt Enable/ Disable
OUNTER CIRCUIT
Timer Started
1
0
O
NE
-S
HOT AND
.
Figure 15
Timer/Counter
Timer Timed
R
16-Bit
E
-
Out
TRIGGERABLE
23
, where the time between successive time-outs (in re-
Timer Interrupt
TIMERCNTL
M
read
ODES
Timer Timed
Out
1
0
TIMERCNTL
read
Timer Interrupt
No Interrupt
XR16V794
Timer Timed
Out