TC94A48FG Datasheet, PDF (13/36 Pages) Toshiba Semiconductor – Single-chip Audio Digital Signal Processor

TC94A48FG
2. Microcontroller Interface
The TC94A48FG can exchange data with a microcontroller in either normal transmission mode or I²C
mode. It uses the MIMD pin to select the mode and inputs/outputs data in MSB-first format.
Table 1 shows the features supported and the pins used in each mode.
Table 2 shows the bit composition of a 24-bit command.
Note 6: This data sheet shows general control methods. Refer to the separate program explanation data sheet for a
complete command list or detailed description of control methods.
Table 1 Pins Used and Features Supported in Normal Transmission Mode and I²C Mode
Transmission Mode
Normal Transmission Mode (MIMD=L)
I²C Mode (MIMD=H)
Pin
Input/Output
Function
Function
/MICS
Input
Chip select Input
Not used (fixed to “L”)
MILP
Input
Latch pulse input
Not used (fixed to “L”)
/MIDIO
/MICK
Input
Output (open-drain)
Input, Input / Output (I²C mode)
Data input / output
Clock input
Data input / output (SDA)
Clock input (SCL)
/MIACK
Output (open-drain)
Acknowledge output
Not used
Note 7: The input High voltage for these pins should be V_DD-0.2 V to 5.5V.
Note 8: The open-drain /MIDIO and /MIACK pins require external pull-up resistors.
In I²C mode, the /MICK pin also requires a pull-up resistor.
The pulled-up voltage for these pins should be V_DD-0.2V to 5.5V.
Note9: The I²C bus write address is 30 h and read address is 31h.
Table 2 Bit Composition of a 24-bit Command
Bit
23-8
7
6
5
4
3-0
Function
Remarks
16-bit address
Refer to the command list in the
program explanation data sheet.
Not used
―
Start program RAM boot
"1" starts program RAM boot.
Specify soft reset
"1" triggers a soft reset.
Specify read or write (R/W)
"1" specifies a read.
Set the number of words to be
transmitted
0h” ; 1word
↓
“7h” ; 8words
13
2005-09-28