General Purpose 16-bit Timer/Counter [TIMERMSB, T" />
參數(shù)資料
型號(hào)： XR17V252IM-0A-EVB
廠商： Exar Corporation
文件頁(yè)數(shù)： 9/69頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR17V252 100TQFP
標(biāo)準(zhǔn)包裝： 1
系列： *
XR17V252
17
REV. 1.0.2
66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT
1.6.2
General Purpose 16-bit Timer/Counter [TIMERMSB, TIMELSB, TIMER, TIMECNTL] (DEFAULT
0XXX-XX-00-00)
A 16-bit down-count timer for general purpose timer or counter. Its clock source may be selected from internal
crystal oscillator or externally on pin TMRCK. The timer can be set to be a single-shot for a one-time event or
re-triggerable for a periodic signal. An interrupt may be generated when the timer times out and will show up as
a Channel 0 interrupt (see Table 8). It is controlled through 4 configuration registers [TIMERCNTL, TIMER,
TIMELSB, TIMERMSB]. The TIMERCNTL register provides the Timer commands such as start/stop, as shown
in Table 10 below. The time-out output of the Timer can also be optionally routed to the MPIO[0] pin. The block
diagram of the Timer/Counter circuit is shown below:
TIMERMSB [31:24] and TIMERLSB [23:16]
The concatentaion of the 8-bit registers TIMERMSB and TIMERLSB forms a 16-bit value which decides the
time-out period of the Timer, per the following equation:
Timer output frequency = Timer input clock / 16-bit Timer value
The least-significant bit of the timer is being bit [0] of the TIMERLSB with most-significant-bit being bit [7] in
TIMERMSB. Notice that these registers do not hold the current counter value when read. Default value is zero
(timer disabled) upon powerup and reset. The ’Reset Timer’ command does not have any effect on this
register.
TIMER [15:8] Reserved
FIGURE 6. TIMER/COUNTER CIRCUIT.
Tim er Interrupt
Tim er
Output
M PIO LVL[0]
0
1
0
1
Tim er Interrupt
No Interrupt
MPIO [0]
TM RCK
OSC. CLOCK
TIM ERCNTL
CO M M ANDS
16-Bit
Tim er/Counter
Start/Stop
Tim er Interrupt Enable/ Disable
Single shot/Re-triggerable
TIM ERM SB and TIM ERLSB
(16-bit Value)
0
1
Clock Select
Route/De-route to M PIO[0]
TIMERMSB Register
Bit-15 Bit-14 Bit-13 Bit-12 Bit-11 Bit-10
Bit-9 Bit-8
TIMERLSB Register
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1 Bit-0
16-Bit Timer/Counter Programmable Registers
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