TABLE 11: TIMER CONTROL C
參數(shù)資料
型號: XR16M598IQ100-F
廠商: Exar Corporation
文件頁數(shù): 21/58頁
文件大小: 0K
描述: IC UART FIFO 16B OCTAL 100QFP
標準包裝: 66
特點: *
通道數(shù): 8
FIFO's: 16 字節(jié)
規(guī)程: RS485
電源電壓: 1.62 V ~ 3.63 V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶調(diào)制解調(diào)器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 100-BQFP
供應(yīng)商設(shè)備封裝: 100-QFP(14x20)
包裝: 托盤
TABLE 11: TIMER CONTROL COMMANDS
TIMERCNTL [7:4] Reserved
TIMERCNTL [3:0] These bits are used to invoke a series of commands that control the function of the Timer/Counter.
The commands 1011 to 1111 are reserved.
0001: Enable Timer Interrupt
0010: Disable Timer Interrupt (default)
0011: Select One-shot mode
0100: Select Re-triggerable mode (default)
0101: Select Internal Crystal Oscillator output as clock source for the Timer (default)
0110: Select External Clock source (through TMRCK pin) for the Timer
0111: Reserved
1000: Reserved
1001: Start Timer
1010: Stop Timer (default)
1011: Reset Timer
Upon power-up or reset, the default states are Timer interrupt disabled, Re-triggerable mode, Crystal
Oscillator as Timer clock source, and Timer stopped.
XR16M598
28
1.62V TO 3.63V HIGH PERFORMANCE OCTAL UART WITH 16-BYTE FIFO
REV. 1.0.0
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
Timer Interrupt
TMRCK
OSC. CLOCK
TIMERCNTL
COMMANDS
16-Bit
Timer/Counter
Start/Stop
Timer Interrupt Enable/ Disable
Single shot/Re-triggerable
TIMERMSB and TIMERLSB
(16-bit Value)
0
1
Clock Select
0
1
Timer Interrupt
No Interrupt
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