SAB82525H-V21 Datasheet, PDF (72/126 Pages) Siemens Semiconductor Group – High-Level Serial Communication Controller Extended

START
SAB 82525
SAB 82526
SAF 82525
SAF 82526
Command
XTF/ XIF
N
Transmit
Pool Ready
?
Y
Write Data
(up to 32 Bytes)
to XFIFO
XPR Interrupt or
XFW Bit in STAR Register = 1
N
End of
Massage
?
Y
Command
XTF/ XIF ⁺ XME
END
ITD00246
Figure 32
Interrupt Driven Data Transmission (Flow Diagram)
The activities at both serial and CPU interface during frame transmission (supposed frame
length = 70 bytes) is shown in figure 33.
Serial
Interface
Transmit Frame (70 Bytes)
32
32
6
HSCX
CPU
Interface
...
...
WR
32 Bytes
XTF
XPR
WR
32 Bytes
...
Command
XTF
XPR
WR XTF + XME
6 Bytes
Figure 33
Interrupt Driven Transmission Sequence Example
Semiconductor Group
72
XPR
ITD00247