tc9447f TOSHIBA Semiconductor CORPORATION, tc9447f Datasheet - Page 13

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

TC9447F
(2-4) 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, data are output on the IFCK signal falling edge from the
MSB first. 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.
13
2002-02-05