SAB82525H datasheet(95/126 Pages) INFINEON

Part #	SAB82525H

Description	Data Communications ICs

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Manufacturer	INFINEON [Infineon Technologies AG]

Direct Link	http://www.infineon.com

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95 / 126 page

Semiconductor Group

95

SAB 82525

SAB 82526

SAF 82525

SAF 82526

Receive Status Register (READ)

RSTA

VFR

RDO

CRC

RAB

HA1

HA0

C/R

LA

(27/67)

70

VFR … Valid Frame

1 … Valid

0 … Invalid

Determines whether a valid frame has been received.

a frame which is not an integer number of 8 bits (n

× 8 bits) in length (e.g. 25 bit), or

a frame which is too short depending on the selected operation mode via MODE (MDS1,

MDS0, ADM) as follows:

–

Auto-/non-auto mode (16-bit address): 4 bytes

Auto-/non-auto mode (8-bit address): 3 bytes

Transparent mode 1:3 bytes.

Transparent mode 0:2 bytes.

Shorter frames are not reported.

Note:

RDO … Receive Data Overflow

A data overflow has occurred within the actual frame.

Caution: Data loss because the CPU did not serve RME or RPF interrupt in time.

CRC … CRC compare/check

0 … CRC check failed; received frame contains errors.

1 … CRC check o.k.; received frame is error-free.

RAB … Receive Message Aborted

An invalid frame is either

The received frame was aborted from the transmitting station.

According to the HDLC protocol, this frame must be discarded by the CPU.

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