Reference Manual

39 ConnectCore 9M 2443 & Wi-9M 2443 Hardware Reference
Chapter 1
Watchdog timer The S3C2443 watchdog timer is used to resume the controller operation whenever it
is disturbed by malfunctions such as noise and system errors. It can be used as a
normal 16-bit interval timer to request interrupt service. The watchdog timer
generates the reset signal for 128 PCLK cycles.
Features:
 16-bit Watchdog Timer
 Interrupt request or system reset at time-out
The prescaler value and the frequency division factor are specified in the watchdog
timer control (WTCON) register. Valid prescaler values range from 0 to 28-1. The
frequency division factor can be selected as 16, 32, 64, or 128.
Use the following equation to calculate the watchdog timer clock frequency and the
duration of each timer clock cycle:
t_watchdog = 1/( PCLK / (Prescaler value + 1) / Division_factor )
IIS-Bus interface IIS (Inter-IC Sound) interface transmits or receives sound data from or to external
stereo audio code cs. For transmit and receive data, two 32x16 FIFOs (First-In-First-
Out) data structures are included and DMA transfer mode for transmitting or
receiving samples can be supported. IIS-specific clock can be supplied from internal
system clock controller through IIS clock divider or direct clock source.
Features:
 1-ch IIS-bus for audio interface with DMA-based operation
 Serial, 8-/16-bit per channel data transfers
 128 Bytes (64-Byte + 64-Byte) FIFO for Tx/Rx
 Supports two IIS formats (MSB-justified or LSB-justified data format)