 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
Z85233 Datasheet(PDF) 92 Page - Zilog, Inc. |
|
||||||||||||||||||||||||||||||
Z85233 Datasheet(HTML) 92 Page - Zilog, Inc. |
|
|
92 / 317 page  SCC™/ESCC™ User’s Manual Data Communication Modes 4-17 4 4.3.3 Transmitter/Receiver Synchronization The SCC contains a transmitter-to-receiver synchronization function that is used to guarantee that the character boundaries for the received and transmitted data are the same. In this mode, the receiver is in Hunt and the transmitter is idle, sending either all 1s or all 0s. When the receiver recognizes a sync character, it leaves Hunt mode; one character time later the transmitter is enabled and begins sending sync characters. Beyond this point the receiver and transmitter are again completely independent, except that the character boundaries are now aligned (Figure 4-10). There are several restrictions on the use of this feature in the SCC. First, it only works with 6-bit, 8-bit or 16-bit sync characters. The data character length for both the receiver and the transmitter must be six bits with 6-bit sync charac- ter, and eight bits with an 8-bit or 16-bit sync character. Of course, the receive and transmit clocks must have the same rate as well as the proper phase relationship. A specific sequence of operations must be followed to syn- chronize the transmitter to the receiver. Both the receiver and transmitter must have been initialized for operation in Synchronous mode sometime in the past, although this ini- tialization need not be redone each time the transmitter is synchronized to the receiver. The transmitter is disabled by setting bit D3 of WR5 to 0. At this point the transmitter will send continuous 1s. If it is required that continuous Table 4-8. Initializing the Receiver in Character-Oriented Mode Bit Number Reg D7 D6 D5 D4 D3 D2 D1 D0 Description WR4 000 x 0000 Select x1 clock, enable sync mode, & no parity x=0 for 8-bit sync, x=1 for 16-bit sync WR3 r x 011000 rx=# of Rx bits/char, No auto enable, enter Hunt, Enable Rx CRC, No sync character load inhibit WR5 d t x 0 0 0 r 1 d=inverse state of DTR pin, tx=# of Tx bits/char, use CRC-16, r=inverse state of /RTS pin, CRC enable WR6 xxxxxxxx sync character, lower byte WR7 xxxxxxxx sync character, upper byte WR10 c 0 0 0 i 0 0 s c=CRC preset, NRZ data, i=idle line condition s=size of sync character WR3 r x 011001 Enable Receiver WR5 d t x 0 1 0 r 1 Enable Transmitter WR0 10000000 Reset CRC generator Figure 4-10. Transmitter to Receiver Synchronization Receiver Leaves Hunt Sync Sync RxD TxD Sync Sync Direction of Message Flow UM010901-0601 |
Similar Part No. - Z85233 |
|
Similar Description - Z85233 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
