HT6221/HT6222

Multi-Purpose Encoders

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6

Setting the address codes (A0 ~ A15)

The algorithm rule of the address codes (A0 ~ A15) can be selected by mask option.

In this case, the 16-bit on-chip MASK ROM (ROM1 and ROM2) are available, and the value of ROM1 (8 bits) and ROM2 (8 bits)

are decided by one MASK LAYER. The current value of ROM1 and ROM2 are both “00H”. The A0~A7 are set by logical OR

between the external switch S0~S7 and the ROM1. The A8~A15 equal some bits inverted to A0 ~ A7, the inversion are decided

by Logical OR between the external switch S8~S15 and the ROM2.

For example:

The following is an illustration of these rules in selecting the address codes (A0~A15).

Values of the data codes (D0~D7)

The HT6221/HT6222 contain 32 and 64 active keys, respectively. Each key corresponds to a data code. For tape deck recording,

the HT6221/HT6222 provide three double-key functions. The double-key, single-key, and double-key operation rules are shown in

Table3, Table 4, Timing 4, Timing 5 and Timing 6.

Table 3: Double-key data code table

KEY

Data Codes D0~D6

Data Code D7

K21+K22

1010110

0/1

K21+K23

0110110

0/1

K21+K24

1110110

0/1

Note:D7 is defined by an external switch