參數(shù)資料
型號(hào)： EP7212
廠商： Cirrus Logic, Inc.
英文描述： HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER AND DIGITAL AUDIO INTERFACE(DAI)
中文描述： 高性能，低功耗系統(tǒng)與LCD控制器和數(shù)字音頻接口（DAI芯片）
文件頁(yè)數(shù)： 23/136頁(yè)
文件大?。?/td> 2289K
代理商： EP7212
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)當(dāng)前第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)
EP7212
DS474PP1
23
2) Ensure that on entry to the Standby State, the
chosen interrupt source is not masked, and the
UART is enabled.
3) Send a preamble that consists of one start bit,
8 bits of zero, and one stop bit. This will cause
the EP7212 to wake and execute the enabled in-
terrupt vector.
The UART will automatically be re-enabled when
the processor re-enters the Operating State, and the
preamble will be received. Since the UART was
not awake at the start of the preamble, the timing of
the sample point will be off-center during the pre-
amble byte. However, the next byte transmitted
will be correctly aligned. Thus, the actual first real
byte to be received by the UART will get captured
correctly.
3.2.2
Idle State
If in the Operating State, the Idle State can be en-
tered by writing to a special internal memory loca-
tion (HALT) in the EP7212. If an interrupt occurs,
the EP7212 will return immediately back to the Op-
erating State and execute the next instruction. The
WAKEUP signal can not be used to exit the Idle
State. It is only used to exit the Standby State.
In the Idle State, the device functions just like it
does when in the Operating State. However, the
CPU clock is halted while it waits for an event such
as a key press to generate an interrupt. The PLL (in
18.432–73.728 MHz mode) or the external
13 MHz clock source always remains active in the
Idle State.
3.2.3
Keyboard Interrupt
For the case of the keyboard interrupt, the follow-
ing options are available and are selectable accord-
ing to bits 1 and 3 of the SYSCON2 register (refer
to the
SYSCON2 Register Description
for details).
If the KBWEN bit (SYSCON2 bit 3) is set low,
then a keypress will cause a transition from a
power saving state only if the keyboard inter-
rupt is non-masked (i.e., the interrupt mask reg-
ister 2 (INTMR2 bit 0) is high).
When KBWEN is high, a keypress will cause
the device to wake up regardless of the state of
the interrupt mask register. This is called the
“Keyboard Direct Wakeup’ mode. In this
mode, the interrupt request may not get ser-
viced. If the interrupt is masked (i.e., the inter-
rupt mask register 2 (INTMR2 bit 0) is low),
the processor simply starts re-executing code
from where it left off before it entered the pow-
er saving state. If the interrupt is non-masked,
then the processor will service the interrupt.
When the KBD6 bit (SYSCON2 bit 1) is low,
all 8 of Port A inputs are OR’ed together to pro-
duce the internal wakeup signal and keyboard
interrupt request. This is the default reset state.
When the KBD6 bit (SYSCON2 bit 1) is high,
only the lowest 6 bits of Port A are OR’ed to-
gether to produce the internal wakeup signal
and keyboard interrupt request. The two most
significant bits of Port A are available as GPIO
when this bit is set high.
In the case where KBWEN is low and the INTMR2
bit 0 is low, it will only be possible to wakeup the
device by using the external WAKEUP pin or an-
other enabled interrupt source. The keyboard inter-
rupt capability allows an OS to use either a polled
or interrupt-driven keyboard routine, or a combina-
tion of both.
NOTE:
3.3
The EP7212 has a power-up sequence that should
be followed for proper start up. If any of the below
recommended timing sequences are violated, then
it is possible that the part may not start-up properly.
This could cause the device to get lost and not re-
cover without a hard reset.
The keyboard interrupt is NOT deglitched.
Power-Up Sequence
相關(guān)PDF資料
PDF描述
EP7212-CB-A HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER AND DIGITAL AUDIO INTERFACE(DAI)
EP7212-CV-A HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER AND DIGITAL AUDIO INTERFACE(DAI)
EP7309 HIGH PERFORMANCE LOW POWER SYSTEM ON CHIP ENHANCED DIGITAL AUDIO INTERFACE
EP7309-CB-C CONN MODULAR JACK 8-8 R/A UNSHLD
EP7309-CR-C HIGH PERFORMANCE LOW POWER SYSTEM ON CHIP ENHANCED DIGITAL AUDIO INTERFACE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EP7212-CB-A 制造商:CIRRUS 制造商全稱(chēng):Cirrus Logic 功能描述:HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER AND DIGITAL AUDIO INTERFACE(DAI)
EP7212-CV-A 制造商:CIRRUS 制造商全稱(chēng):Cirrus Logic 功能描述:HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER AND DIGITAL AUDIO INTERFACE(DAI)
EP7212-CV-D 制造商:Rochester Electronics LLC 功能描述:- Bulk
EP7230 功能描述:電氣外殼配件 E-PANEL FITS 72 X 30 RoHS:否 制造商:Hammond Manufacturing 產(chǎn)品:Rack Accessories 類(lèi)型: 面板寬度: 面板高度: 外部寬度: 外部高度: 外部深度: 顏色:Black
EP7236 功能描述:電氣外殼配件 E-PANEL FITS 72 X 36 RoHS:否 制造商:Hammond Manufacturing 產(chǎn)品:Rack Accessories 類(lèi)型: 面板寬度: 面板高度: 外部寬度: 外部高度: 外部深度: 顏色:Black
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*