- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385489 > LM8333 (NATIONAL SEMICONDUCTOR CORP) Keypad Controller with I/O Expansion and ACCESS.bus Host Interface PDF資料下載
參數(shù)資料
| 型號(hào)： | LM8333 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Keypad Controller with I/O Expansion and ACCESS.bus Host Interface |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, BGA49 |
| 封裝： | MICRO, BGA-49 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大小： | 768K |
| 代理商： | LM8333 |
7.0 Device Operation
(Continued)
The data is sent from the slave to the host in the fourth byte.
This byte ends with a negative acknowledgement (NACK) to
indicate the end of the data.
7.6 WAKE-UP FROM HALT MODE
Any bus transaction initiated by the host may encounter the
LM8333 device in Halt mode or busy with processing data,
such as controlling the FIFO buffer or executing interrupt
service routines.
Figure 10
shows the case in which the host sends a com-
mand while the LM8333 is in Halt mode (CPU clock is
stopped). Any activity on the ACCESS.bus wakes up the
LM8333, but it cannot acknowledge the first bus cycle im-
mediately after wake-up.
The host drives a Start condition followed by seven address
bits and a R/W bit. The host then releases SDA for one clock
period, so that it can be driven by the LM8333.
If the LM8333 does not drive SDA low during the high phase
of the clock period immediately after the R/W bit, the bus
cycle terminates without being acknowledged (shown as
NACK in
Figure 10
). The host then aborts the transaction by
sending a Stop condition. After aborting the bus cycle, the
host may then retry the bus cycle. On the second attempt,
the LM8333 will be able to acknowledge the slave address,
because it will be in Active mode.
Alternatively, the I
2
C specification allows sending a START
byte (00000001), which will not be acknowledged by any
device. This byte can be used to wake up the LM8333 from
Halt mode.
The LM8333 may also stall the bus transaction by pulling the
SCL low, which is a valid behavior defined by the I
2
C
specification.
20210611
FIGURE 9. Host Read Command
20210612
FIGURE 10. LM8333 Responds with NACK, Host Retries Command
L
www.national.com
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM8400 | Four Wire Resistive Touchscreen Controller with Brownout |
| LM8500 | Four Wire Resistive Touchscreen Controller with Brownout |
| LM8500HLQ9 | Four Wire Resistive Touchscreen Controller with Brownout |
| LM8500HMT9 | Four Wire Resistive Touchscreen Controller with Brownout |
| LM8500HVA9 | Four Wire Resistive Touchscreen Controller with Brownout |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM8333_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface |
| LM8333EVALKIT | 功能描述:其他開發(fā)工具 LM8333 AND SOFTWARE EVAL KIT RoHS:否 制造商:Parallax 產(chǎn)品:ELEV-8 Hex Upgrade Kits 類型:Robotics 工具用于評(píng)估:ELEV-8 Quadcopter 工作電源電壓: |
| LM8333FLQ8X | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface |
| LM8333FLQ8X/NOPB | 功能描述:接口 - 專用 RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
| LM8333FLQ8Y | 制造商:Texas Instruments 功能描述:Mobile I/O Companion Supporting Key Scan 32-Pin LLP EP |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。