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參數(shù)資料
| 型號： | CY22395 |
| 廠商： | Cypress Semiconductor Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| 中文描述： | 位AVR微控制器具有8K字節(jié)的系統(tǒng)內可編程閃存 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 235K |
| 代理商： | CY22395 |
CY22393
CY22394
CY22395
Document #: 38-07186 Rev. *B
Page 9 of 19
Read Operations
Read operations are initiated the same way as Write opera-
tions except that the R/W bit of the slave address is set to ‘1’
(HIGH). There are three basic read operations: current
address read, random read, and sequential read.
Current Address Read
The CY22393,CY22394 and CY22395 has an onboard
address counter that retains 1 more than the address of the
last word access. If the last word written or read was word ‘n’,
then a current address read operation would return the value
stored in location ‘n+1’. When the CY22393,CY22394 and
CY22395 receives the slave address with the R/W bit set to a
‘1’, the CY22393,CY22394 and CY22395 issues an
acknowledge and transmits the 8-bit word. The master device
does not acknowledge the transfer, but does generate a STOP
condition, which causes the CY22393,CY22394 and CY22395
to stop transmission.
Random Read
Through random read operations, the master may access any
memory location. To perform this type of read operation, first
the word address must be set. This is accomplished by
sending the address to the CY22393,CY22394 and CY22395
as part of a write operation. After the word address is sent, the
master generates a START condition following the
acknowledge. This terminates the write operation before any
data is stored in the address, but not before the internal
address pointer is set. Next the master reissues the control
byte with the R/W byte set to ‘1’. The CY22393,CY22394 and
CY22395 then issues an acknowledge and transmits the 8-bit
word. The master device does not acknowledge the transfer,
but does generate a STOP condition which causes the
CY22393,CY22394 and CY22395 to stop transmission.
Sequential Read
Sequential read operations follow the same process as
random reads except that the master issues an acknowledge
instead of a STOP condition after transmission of the first 8-bit
data word. This action results in an incrementing of the internal
address pointer, and subsequently output of the next 8-bit data
word. By continuing to issue acknowledges instead of STOP
conditions, the master may serially read the entire contents of
the slave device memory. Note that register addresses outside
of 08H to 1BH and 40H to 57H can be read from but are not
real registers and do not contain configuration information.
When the internal address pointer points to the FFH register,
after the next increment, the pointer will point to the 00H
register.
SCL
START
Condition
SDAT
STOP
Condition
Data may
be changed
Address or
Acknowledge
Valid
Figure 1. Data Transfer Sequence on the Serial Bus
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CY22395FC | 制造商:Cypress Semiconductor 功能描述:Programmable PLL Clock Generator Triple 16-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述:FIELD RE-PROGRAMMABLE CLOCK GENERATOR - Bulk |
| CY22395FCT | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Three-PLL Serial-Programmable Flash-Programmable Clock Generator |
| CY22395FI | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Three-PLL Serial-Programmable Flash-Programmable Clock Generator |
| CY22395FX I | 制造商:Cypress Semiconductor 功能描述:Programmable PLL Clock Generator Triple 16-Pin TSSOP |
| CY22395FXC | 功能描述:鎖相環(huán) - PLL 3-PLL Clk Syn COM RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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