The register map of the TLV320AIC3104-Q1 actually consists of two pages of registers, with each page containing 128 registers. The register at address zero on each page is used as a page-control register, and writing to this register determines the active page for the device. All subsequent read/write operations access the page that is active at the time, unless a register write is performed to change the active page. The active page defaults to page 0 on device reset.

For example, at device reset, the active page defaults to page 0, and thus all register read/write operations for addresses 1 to 127 access registers in page 0. If registers on page 1 must be accessed, the user must write the 8-bit sequence 0x01 to register 0, the page control register, to change the active page from page 0 to page 1. After this write, it is recommended that the user also read back the page control register, to ensure the change in page control has occurred properly. Future read/write operations to addresses 1 to 127 now access registers in page 1. When page-0 registers must be accessed again, the user writes the 8-bit sequence 0x00 to register 0, the page control register, to change the active page back to page 0. After a recommended read of the page control register, all further read/write operations to addresses 1 to 127 access page-0 registers again.