Pin No. Terminal
Name
I/O Function I/O Setting Description
42 R62 I/O O LED2
43 R63 I/O O LED3
44 R70 I/O O LED4
45 R71 I/O O LED5
46 R72 I/O O LED6
47 R73 I/O O LED7
48 R80 I/O O HF SP vol 1
49 R81 I/O O HF SP vol 2
50 R82 I/O O HF SP vol 3
51 R83 I/O O HF SP vol 4
52 R90 I/O O Tone cont 1
53 R91 I/O O Tone cont 2
54 R92 I/O O Tone cont 3
55 R93 I/O O Tone cont 4
56 RA0 I/O O HS SP vol 1
57 RA1 I/O O HS SP vol 2
58 SEL I I A Four-minute Cycle Vcc Connection
59 VCC - -
60 TONC O O DTMF Column
61 TONR O O DTMF Row
62 VTref - - DTMF Standard Power
63 RD0 I I Head Set Detention
64 RD1 I I TONE-DET
6. BLOCK DIAGRAM
7. CIRCUIT OPERATIONS
7.1. KEY INPUT CONTROL CIRCUIT
Sequential input information is executed by dynamic scanning.
The ports R20~R23, R30, R31 of IC1 are brought to high status consecutively.
If a key is pressed, the key-in information input is executed by ports R00~R03, R10~R13.
8
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