U3750BM Datasheet, PDF (19/20 Pages) TEMIC Semiconductors – One Chip Telephone Circuit

TELEFUNKEN Semiconductors
U3750BM
If the redial is ordered after a manual dialing the redial is
executed according to the digits already transmitted in
line.
The redial is effective if the comparison digit-by-digit of
all digits is correct. It is not produced if the comparison
is incorrect or if the number of digits exceeded the last
capacity of the redial. During redial, entry codes are
accepted.
Procedure with *
Storage does not pertain to the “*” code and the codes
entered after it when the manual dialing starts with a
numeric code or A, B, C, D, #, or pause codes. If the
dialing starts with the “*” code, all codes can be stored.
Note: the “#” code is treated for storage like a number.
Procedure with flash
The flash pulse does not reset the content of the RAM.
Example: 1 2 3 R
Redial µ å 1 2 3 R 1 2 3
Redial µ å 1 2 3
Erasing redial
The erasing is possible through the serial bus with the
decimal codes 16 and 23. There is not much difference
between these two codes: code 16 always erases the
redial, code 23 inhibits a later redial if it is transmitted
after or before dialing codes. The following examples
illustrates this.
Transmitted Codes
123
16
Redial µ
123
23
Redial µ
123
16
Redial µ
123
23
Redial µ
123
R
Redial µ
123
R
Redial µ
Special Case
On Line
123
–nothing
123
–
4µ
1234
4
4µ
1234
–
16 ^{µ 1 2 3 R}
–
23 ^{µ 1 2 3 R}
123
When the overflow flag is set and when the written
address counter becomes equal to the read address
counter, the codes are not stored.
Dimensions in mm
Package: PLCC 44
Rev. A1: 16.07.1996
19 (20)