參數(shù)資料
型號: XR17D158
廠商: Exar Corporation
英文描述: UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
中文描述: 通用(3.3V和5V)PCI總線八進制的UART
文件頁數(shù): 19/72頁
文件大?。?/td> 1520K
代理商: XR17D158
xr
REV. 1.2.1
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
XR17D158
19
2.2.2
General Purpose 16-bit Timer/Counter [TIMERMSB, TIMELSB, TIMER, TIMECNTL] (
DEFAULT
0
X
XX-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 continue interval. An interrupt may be generated in the INT Register when the timer times out.
It is controlled through 4 configuration registers [TIMERCNTL, TIMER, TIMELSB, TIMERMSB]. These
registers provide start/stop and re-triggerable or one-shot operation. The time-out output of the Timer can be
set to generate an interrupt for system or event alarm.
TIMER [15:8] Reserved
F
IGURE
7. T
IMER
/C
OUNTER
CIRCUIT
.
T
ABLE
8: TIMER CONTROL R
EGISTERS
TIMERCNTL [0]
Logic zero (default) disables Timer-Counter interrupt and logic one enables the interrupt, reading the
TIMERCNTL clears the interrupt.
TIMERCNLT [1]
Logic zero (default) stops/pauses the timer and logic one starts/re-starts the timer/counter.
TIMERCNTL [2]
Logic zero (default) selects re-trigger timer function and logic one selects one-shot (timer function.
TIMERCNTL [3]
Logic zero (default) selects internal and logic one selects external clock to the timer/counter.
TIMERCNTL [4]
Routes the Timer-Counter interrupt to MPIO[0] if MPIOSEL[0]=0 for external event control.
TIMERCNTL [7:5]
Reserved (defaults to zero)
TMRCK
OSC. CLOCK
TIMERCNTL [3]
16-Bit
Timer/Counter
TIMERCNTL [2]
Re-trigger
Single-shot
TIMERCNTL [1]
Start/Stop
TIMERCNTL [0]
Timer Interrupt, Ch-0 INT=7
Time-out
Timer Interrupt Enable
Single/Re-triggerable
TIMERMSB and TIMERLSB
(16-bit Value)
0
1
0
1
0
1
No Interrupt
Clock
Select
TIMERCNTL [4]
0
1
MPIO[0]
MPIOLVL[0]
TIMERCNTL Register
Rsvd
Rsvd
Rsvd
MPIO[0]
Control
Clock
Select
Single/
Re-trigger
Start/
Stop
INT
Enable
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
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