tc9447f TOSHIBA Semiconductor CORPORATION, tc9447f Datasheet - Page 27

• Manufacturer Part Number: tc9447f
• Description: Single-chip Audio Digital Signal Processor
• Manufacturer: TOSHIBA Semiconductor CORPORATION

4. Self-boot function description
(1)
(2)
Self-boot function
The TC9447F supports a self-boot function for setting coefficients and offsets. As Figure 1 shows, the
data are set via the microcontroller interface circuit.
First saving the data to be set via the microcontroller in the self-boot ROM (SBROM) allows various
modes to be set later. The microcontroller interface circuit supports two formats: I
mode. However, the boot must be executed in Standard Transmission (the original) mode.
Boot ROM format
The following shows the breakdown of the 18 bits.
Boot mode completes when the address reaches 3FFh, the maximum value.
Therefore, for the final address, write JMP 3FFh (data = 303FFh).
00
01
10
11
Data that are being sent
Command
Final data (after the data are sent, the CS signal is set to “H”).
Jump address (jump to any address in the self-boot ROM).
Figure 2 Boot ROM Format and Example
Figure 1 Self-boot system
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C and the original
2002-02-05
TC9447F