U3501BM Datasheet, PDF (14/20 Pages) TEMIC Semiconductors – Cordless Telephone Signal Processor

U3501BM
Serial Bus Interface
The circuit is remoted by an external microcontroller
trough the serial bus.
The data is an 12 – bit word:
B11 – B8: address of the destination register (0 to 15)
B7 – B0: contents of register
The data line must be stable when the clock is high and
data must be serially shifted.
After 12 clock periods, the transfer to the destination reg-
ister is (internally) generated by a low to high transition
of the data line when the clock is high.
Micro-
processor
Data
Clock
Figure 10.
D
C
96 11787
Data
(D)
Clock
(C)
b0 b1 b2
b9 b10 b11
1st word
Word transmission
Figure 11. Serial bus transmission
2nd word
Transfer condition
96 11788
Data
Clock
4
0
Address
Decoder
15
Figure 12.
8
128 latches
Commands
96 11789
14 (20)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 29-Jul-96