TS68HC901 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TS68HC901' PDF : 42 Pages View PDF
TS68HC901
Figure 6 :
V7
V6
V5
V4
IV3
IV2
IV1
IV0
V7-V4
IV3-IV0
The four most significant bits are copied from the register
These bits are supplied by the CMFP. They are the binary channel number of the highest
priority channel that is requesting interrupt service.
Figure 7 :
7
VECTOR REGISTER
0
VR
(17h)
V7
V6
V5
V4
S
0*
0*
0*
V7-V4
S
*
Writing 0 : CLEARED
Writing 1 : SET
CLEARED on RESET
The upper four bits of the vector register are written by the user. These bits become the most
significant four bits of the interrupt vector number.
In-Service Register Enable. When the S bit is zero, the CMFP is in the automatic end-of-in-
terrupt mode and the In-Service register bits are forced low. When the S bit is a one, the
CMFP is in the software end-of-interrupt mode and the In-Service register bits are enabled.
Unused bits, read as zero.
Figure 8 : Daisy Chaining
TS68HC901
TS68HC901
TS68HC901
10/42
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