MA5883 chip equivalent, 20 memory ld/dtmf switchable dialler chip.
and circuit configurations.
COL 6 IMP SELECT MASK OSC OUT OSC IN FILT IN FILT OUT HSW VSS VDD PAUSE OUT
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
.
where the user must first dial an access digit, or digits, and then wait for a second dial tone before continuing diall.
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