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B2

B1

B0

B5

B4

B3

AI

B6

TCA6424

WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

SCPS175 – NOVEMBER 2007

The control register includes an Auto-Increment (AI) bit which is the most significant bit (bit 7) of the command

byte. At power-up, the control register defaults to 00 (hex), with the AI bit set to logic 1, and the lowest 7 bits set

to logic 0.

If AI is 1, the 2 least significant bits are automatically incremented after a read or write. This allows the user to

program and/or read the 3 register banks sequentially. If more than 3 bytes of data are written when AI is 1,

previous data in the selected registers will be overwritten. Reserved registers are skipped and not accessed

(refer to Table 5).

If AI is 0, the 2 least significant bits are not incremented after data is read or written. During a read operation, the

same register bank is read each time. During a write operation, data is written to the same register bank each

time.

Reserved command codes and command byte outside the range stated in the Command Byte table must not be

accessed for proper device functionality.

Figure 5. Control Register Bits

Copyright © 2007, Texas Instruments Incorporated

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