SAF82525 Infineon Technologies AG, SAF82525 Datasheet - Page 98

• Manufacturer Part Number: SAF82525
• Description: Data Communications ICs
• Manufacturer: Infineon Technologies AG

Note 2:
Receive HDLC Control Register (READ)
RHCR
Value of the HDLC control field corresponds to the last received frame.
Note:
Note 1:
Note 3:
bit
Semiconductor Group
Mode
Auto-mode,1-byte address
(U-frames) (Note 1)
Auto-mode, 2-byte address
(U-frames) (Note 1)
Auto-mode, 1-byte address
(I-frames) (Note 1)
Auto-mode, 2-byte address
(I-frames) (Note 1)
Non-auto mode,
1-byte address
Non-auto mode,
2-byte address
Transparent
mode 1
Transparent
mode 0
RHCR is duplicated into RFIFO for every frame.
S-frames are handled automatically and are not transferred to the microprocessor.
For U-frames (bit 0 of RHCR = 1) the control field is as in the modulo 8 case.
For I-frames (bit 0 of RHCR = 0) the compressed control field has the same format
as in the modulo 8 case, but only the three LSB’s of the receive and transmit
counters are visible:
7
7
N(R)
6
Modulo 8 (MCS = 0)
Control field
Control field
Control field
Control field
2
3
3
2
5
nd
rd
rd
nd
byte after flag
byte after flag
byte after flag
byte after flag
P
4
RHCR
98
3
Contents of RHCR
N(S)
2
Modulo 128 (MCS = 1)
Control field
(Note 2)
Control field
(Note 2)
Control field in
compressed form (Note 3)
Control field in
compressed form (Note 3)
1
0
SAB 82525
SAB 82526
SAF 82525
SAF 82526
0
0
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