- 您现在的位置：买卖IC网 > PDF目录11834 > XR68C92CV-F (Exar Corporation)DUAL CHANNEL UART 44LQFP PDF资料下载
参数资料
| 型号： | XR68C92CV-F |
| 厂商： | Exar Corporation |
| 文件页数： | 5/33页 |
| 文件大小： | 0K |
| 描述： | DUAL CHANNEL UART 44LQFP |
| 标准包装： | 160 |
| 特点： | * |
| 通道数： | 2，DUART |
| FIFO's： | 16 字节 |
| 电源电压： | 2.97 V ~ 5.5 V |
| 带自动流量控制功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LQFP |
| 供应商设备封装： | 44-LQFP（10x10） |
| 包装： | 托盘 |
第1页第2页第3页第4页当前第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页
XR68C92/192
13
Rev. 1.33
dress 0x7) can be from 0x0001 through 0xFFFF and can
be changed at any time. At power-up and after reset, the
C/T operates in counter mode.
COUNTER MODE
In counter mode, the CPU can start and stop the C/T.
This mode allows the C/T to function as a system
stopwatch or a real-time single interrupt generator. In
this mode, the C/T counts down from the pre-load
value using the programmed counter clock source.
When a read at the start counter command register
(address 0xE) is performed, the counter is initialized to
the pre-load value and begins a countdown sequence.
When the counter counts from 0x0001 to 0x0000
(terminal count), the C/T-ready bit in the interrupt
status register (ISR Bit-3) is set.
3
Users can program the counter to generate an inter-
rupt request for this condition on the -INT output by
unmasking the bit-3 in the Interrupt Mask Register
(IMR, address 0x5). After 0x0000 the count becomes
0xFFFF, and the counter continues counting down
from there. If the CPU changes the pre-load value, the
counter will not recognize the new value until it receives
the next start counter command (and is reinitialized).
When a read at the stop counter command register
(address 0xF) is performed, the counter stops the
countdown sequence and clears ISR Bit-3. The count
value should only be read while the counter is stopped
because only one of the count registers (either CUR, at
address 0x6 or CLR, at address 0x7) can be read at a
time. If the counter is running, a decrement of CLR that
requires a borrow from the CUR could take place
between the two register reads. Figure 2 shows the
C/T output in the counter mode. OP3 can be pro-
grammed to show the C/T output.
In addition to the watch dog timer described above, the
C/T can be used for receive timeout function (see
description under CRA, CRB in the registers section
also). The C/T is more accurate and the timeout period
is programmable unlike the watchdog timer. However,
only one channel can use the C/T for receive timeout
at any given time. The C/T timeout mode uses the
received data stream to start the counter. Each time a
character is shifted from the receive shift register to the
receive FIFO, the C/T is reloaded with the pro-
grammed value in CTPU and CTPL and it restarts on
the next C/T clock. If a new character is not received
before the C/T reaches terminal count (= 0x0000), a
counter ready interrupt (ISR bit-3) is generated. The
user can appropriately program the CTPU and CTPL
for the desired timeout period. Typically this is slightly
more than one character time. Note that if C/T is used
for receiver timeout, a counter ready interrupt is gener-
ated whereas if the watchdog timer is used, a receiver
ready interrupt is generated.
TIMER MODE
In the timer mode, the C/T runs continuously once the
start command is issued (by reading the start C/T
PRELOAD
VALUE
TERMINAL
COUNT
C/T OUTPUT IN
COUNTER MODE
C/T OUTPUT IN
TIMER MODE
PRELOAD
VALUE
TERMINAL
COUNT
PRELOAD
VALUE
TERMINAL
COUNT
PRELOAD
VALUE
PRELOAD
VALUE
TERMINAL
COUNT
TERMINAL
COUNT
TERMINAL
COUNT
PRELOAD
VALUE
PRELOAD
VALUE
START C/T COMMAND
ISSUED
PRELOAD
VALUE
TERMINAL
COUNT
Figure 2: C/T output in Timer and Counter modes.
相关PDF资料 |
PDF描述 |
|---|---|
| XR88C192IJ-F | IC UART FIFO DUAL 44PLCC |
| VI-JWJ-IW-F3 | CONVERTER MOD DC/DC 36V 100W |
| XR88C681P/40-F | IC UART CMOS DUAL 40PDIP |
| MS27472T16B8PA | CONN RCPT 8POS WALL MT W/PINS |
| MS27473E12F8PA | CONN PLUG 8POS STRAIGHT W/PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XR68C92CVTR-F | 功能描述:UART 接口集成电路 Dual Channel UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR68C92IJ | 制造商:EXAR 制造商全称:EXAR 功能描述:DUAL UNIVERSAL ASYNCHRONOUS RECEIVER AND TRANSMITTER |
| XR68C92IJ-F | 功能描述:UART 接口集成电路 Dual Channel UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR68C92IJTR-F | 功能描述:UART 接口集成电路 Dual Channel UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR68C92IP | 制造商:EXAR 制造商全称:EXAR 功能描述:DUAL UNIVERSAL ASYNCHRONOUS RECEIVER AND TRANSMITTER |
发布紧急采购，3分钟左右您将得到回复。