tc9447f TOSHIBA Semiconductor CORPORATION, tc9447f Datasheet - Page 10

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

TC9447F
(1-4) Monitor mode
Monitor mode is used to monitor the data bus or pointers.
There are two further modes: a mode where the data bus or pointer (s) is monitored at a preset
program counter (PC) and a mode where a loop counter (LC) is added to monitor conditions in
addition to the PC. After the command is issued, when the TC9447F loads data to the IFDO
register (IFDOR), the IFOK pin signal is set to Low (see (1) above).
Next, when the IFCK signal is sent, the data are output on the IFCK signal falling edge starting
from the MSB. The data length is at its maximum (24 bits or three bytes) during monitoring of
the data bus. In cases where transfer must be interrupted, such as where only eight or 16 bits of
the MSB side are required, monitoring can be interrupted at any time by setting the CS signal
to High. When the CS signal goes High, the IFOK signal also goes High.
When CS = H, all monitor circuits are initialized.
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2002-02-05