SAB82525H-V21 datasheet(35/126 Pages) SIEMENS | High-Level Serial Communication Controller Extended

Part No.	SAB82525H-V21

Description	High-Level Serial Communication Controller Extended

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Manufacturer	SIEMENS [Siemens Semiconductor Group]

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Semiconductor Group

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SAB 82525

SAB 82526

SAF 82525

SAF 82526

Since the on-chip timer of the HSCX must be operated in the external mode (a secondary may

not poll the primary for acknowledgements), time supervisory must be done by the primary

station.

Upon the arrival of an acknowledgement the XFIFO is enabled and an interrupt is forwarded

to the CPU, either the

– message has been acknowledged as positive (XPR interrupt), or the

– message must be repeated (XMR interrupt).

Additionally, the timer can be used under CPU control to provide timer recovery of the

secondary if no acknowledgements are received at all.

Note: The transmission of transparent frames is possible only if the permission to send is

achieved by an S-frame (p = 1) or I-frame.

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