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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(yè)數(shù)： | 13/17頁(yè) |
| 文件大小： | 768K |
| 代理商： | LM8333 |
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8.0 Interrupts
(Continued)
8.5 COMMAND EXECUTION SUMMARY
With the interrupt, status, and error codes, the LM8333
provides the features needed to support a reliable key-
scan functionality.
Up to 14 key-scan events can be stored in an internal
FIFO buffer. The end of buffer is indicated with the 00
(empty character) code.
The host can repeatedly read the FIFO without modifying
the FIFO pointer using the RPT_FIFO_READ command
(0x21), for example if an error is encountered during a
read.
The LM8333 asserts the IRQ output low when a new
character is pressed after the last interrupt acknowledge
from the host. The IRQ output will be deasserted after the
host has acknowledged the interrupt by reading the inter-
rupt code using the READ_INT command (0xD0).
The host can synchronize with the LM8333 by reading
the status code with the READ_STAT command (0xE0).
The status code verifies whether the last command was
successfully completed.
Two GPIO pins on the LM8333 may be configured as
external interrupt inputs. A rising or falling edge on an
enabled interrupt input triggers wake-up from Halt mode
and asserts an interrupt to the host by pulling the IRQ
output low.
The host can change the debounce time from the default
time of 10 ms. This can be used for reliable scanning of
keyboards with noisy contacts. The debounce time can
be set to about 1 second in steps of 4 milliseconds. The
debounce time is set with the DEBOUNCE command
(0x22).
The host can change the active time permitted before
entering Halt mode from the default period of 500 ms.
The active time is the time during which the keypad is
scanned after the last key is released, before entering
Halt mode. The active time must be longer than the
debounce time.
The host can program the direction and output state of
four general-purpose I/O pins. The host can also read the
states on these pins.
The host can program a 16-bit timer for generating a
PWM output. If the PWM function is not used, the PWM
pin can be used as a general-purpose output.
20210613
FIGURE 11. Interrupt Processing
L
www.national.com
13
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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(kāi)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 |
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