SAB 82525
SAB 82526
SAF 82525
SAF 82526
START
Transmit
Pool Ready
?
N
XPR Interrupt or
XFW Bit in STAR Register = 1
Y
Write Data
Command
XTF/XIF
(up to 32 Bytes)
to XFIFO
End of
Massage
N
?
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.
(70 Bytes)
Transmit Frame
Serial
Interface
32
32
6
HSCX
CPU
Interface
. . .
. . .
. . .
WR
32 Bytes
XTF
WR
32 Bytes
Command
XTF
WR
6 Bytes
XTF + XME
XPR
XPR
XPR
ITD00247
Figure 33
Interrupt Driven Transmission Sequence Example
Semiconductor Group 72
SIEMENS [ Siemens Semiconductor Group ]
