tc9447f TOSHIBA Semiconductor CORPORATION, tc9447f Datasheet - Page 32

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

5. Cautions on use
(1)
(2)
(3)
(2-1) Please do not transmit the following command before completing rewriting of data.
(2-2) Please do not include data of an intact address.
(2-3) Please do not perform continuation transmission over the 0th address.
(3-1) At the time of reset command use
The cautions at the time of using IFOK terminal
The timing which outputs IFOK signal is the signal which shows whether the command received from
the microcomputer was performed normally.
Since the initial value of IFCK signal is unfixed when a control microcomputer is checking IFOK
signal, before sending a command, it may stop performing control from a microcomputer.
The cautions at the time of using ACMP (address comparing mode)
In rewriting coefficient data and offset data using ACMP mode, please do not use it the following
condition.
cautions I
The following cautions are required when transmitting a reset command and a boot command in the
Please do not send the following command before completing rewriting of data of CRAM or
OFRAM.
Please check that waiting the term after rewriting of data is completed until it transmits the
following command was carried out, or rewriting has been completed using IFOK signal.
Please do not include coefficient data of offset data of an address which are not used by the
program under execution, into transmitting data.
When data of an intact address is contained, operation in ACMP mode cannot be ended.
If the following command is transmitted in this state, RAM data will become unfixed also by the
command with the command unrelated to CRAM or OFRAM.
It needs to reset and all data needs to be re-set up to interrupt before completing rewriting of data
in the rewriting processing.
The transmission over the 0th address may incorrect-operate.
The same of this restriction is said not only of ACMP mode but continuation transmission of
usual RAM data.
For example, when writing in 007h from 1BFh and 000h from 1B8h of CRAM, it must transmit in
2 steps.
When transmitting a reset command (4Fh: M-RST) from a microcomputer, the acknowledgement
signal in front of the end conditions outputted from IFDI terminal is not transmitted to a
microcomputer.
Therefore, the acknowledgement signal of the last of IFDI signal should repeal at the time of
reset command transmission.
The timing at the time of reset command transmission is shown if Figure 4.
2
C bus mode at the time of using the I
Figure 4 Timing at the time of command transmission
32
2
C bus mode.
2002-02-05
TC9447F