전자부품 데이터시트 검색엔진 |
|
X1227S8 데이터시트(PDF) 11 Page - Xicor Inc. |
|
X1227S8 데이터시트(HTML) 11 Page - Xicor Inc. |
11 / 28 page X1227 REV 1.1.20 1/13/03 Characteristics subject to change without notice. 11 of 28 www.xicor.com Figure 7. Valid Data Changes on the SDA Bus Figure 8. Valid Start and Stop Conditions SCL SDA Data Stable Data Change Data Stable SCL SDA Start Stop Figure 9. Acknowledge Response From Receiver SCL from Master Data Output from Transmitter Data Output from Receiver 8 1 9 Start Acknowledge DEVICE ADDRESSING Following a start condition, the master must output a Slave Address Byte. The first four bits of the Slave Address Byte specify access to either the EEPROM array or to the CCR. Slave bits ‘1010’ access the EEPROM array. Slave bits ‘1101’ access the CCR. When shipped from the factory, EEPROM array is UNDEFINED, and should be programmed by the cus- tomer to a known state. Bit 3 through Bit 1 of the slave byte specify the device select bits. These are set to ‘111’. The last bit of the Slave Address Byte defines the oper- ation to be performed. When this R/W bit is a one, then a read operation is selected. A zero selects a write operation. Refer to Figure 10. After loading the entire Slave Address Byte from the SDA bus, the X1227 compares the device identifier and device select bits with ‘1010111’ or ‘1101111’. Upon a correct compare, the device outputs an acknowledge on the SDA line. Following the Slave Byte is a two byte word address. The word address is either supplied by the master device or obtained from an internal counter. On power up the internal address counter is set to address 0h, so a current address read of the EEPROM array starts at address 0. When required, as part of a random read, the master must supply the 2 Word Address Bytes as shown in Figure 10. In a random read operation, the slave byte in the “dummy write” portion must match the slave byte in the “read” section. That is if the random read is from the array the slave byte must be 1010111x in both instances. Similarly, for a random read of the Clock/ Control Registers, the slave byte must be 1101111x in both places. |
유사한 부품 번호 - X1227S8 |
|
유사한 설명 - X1227S8 |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |