XR16V798 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XR16V798' PDF : 56 Pages View PDF
XR16V798
REV. 1.0.1
HIGH PERFORMANCE 2.25V TO 3.6V OCTAL UART WITH FRACTIONAL BAUD RATE
TIMER OPERATION
The following paragraphs describe the operation of the 16-bit Timer/Counter. The following conventions will be
used in this discussion:
■ ’N’ is the 16-bit value programmed in the TIMER MSB, LSB registers
■ ‘N’ can take any value from 0x0002 to 0xFFFF.
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 Figure 15, where the time between successive time-outs (in re-
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.
FIGURE 14. TIMER/COUNTER CIRCUIT.
TIMERMSB and TIMERLSB
(16-bit Value)
TMRCK
1
OSC. CLOCK
0
Timer Interrupt
1
16-Bit
0
Timer/Counter
Clock Select
Start/Stop
TIMERCNTL
COMMANDS Single shot/Re-triggerable
Timer Interrupt Enable/ Disable
Timer Interrupt
No Interrupt
FIGURE 15. INTERRUPT OUTPUT IN ONE-SHOT AND RE-TRIGGERABLE MODES
Timer Started
Timer Timed
Out
TIMERCNTL
read
One-shot Mode
Re-triggerable
Mode
Timer Timed TIMERCNTL Timer Timed
Out
read
Out
25
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