参数资料
型号: XR16L788CQ-F
厂商: Exar Corporation
文件页数: 16/54页
文件大小: 0K
描述: IC UART 64B 3.3V OCTAL 100QFP
标准包装: 66
特点: *
通道数: 8
FIFO's: 64 字节
规程: RS485
电源电压: 2.97 V ~ 5.5 V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
安装类型: 表面贴装
封装/外壳: 100-BQFP
供应商设备封装: 100-QFP(14x20)
包装: 托盘
其它名称: 1016-1283
XR16L788
23
REV. 1.2.3
HIGH PERFORMANCE 2.97V TO 5.5V OCTAL UART
3.1.2
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 event. 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.
TABLE 9: UART CHANNEL [7:0] INTERRUPT SOURCE ENCODING AND CLEARING
PRIORITY
Bit
2
Bit
1
Bit
0
INTERRUPT SOURCE(S) AND CLEARING
x
0
None
1
0
1
RXRDY & RX Line Status (logic OR of LSR[4:1]). RXRDY INT clears by reading data in the RX
FIFO until it falls below the trigger level; RX Line Status INT cleared after reading LSR register.
2
0
1
0
RXRDY Time-out: Cleared same way as RXRDY INT.
3
0
1
TXRDY, THR or TSR (auto RS485 mode) empty, clears after reading ISR register.
4
1
0
MSR, RTS/CTS or DTR/DSR delta or Xoff/Xon or special character detected. The first two
clears after reading MSR register; Xoff/Xon or special char. detect INT clears after reading ISR
register.
5
1
0
1
Reserved.
6
1
0
Reserved.
7
1
TIMER Time-out, shows up as a channel 0 INT. It clears after reading the TIMERCNTL register.
Reserved in other channels.
FIGURE 15. TIMER/COUNTER CIRCUIT
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
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