BULLDOG SOC WDOG_TIMER This is the timer module for the Bulldog Chip. \preserve\ This timer module consists of: - A Fixed clock divider - A prescaler to create4 a programmable clock divider - 2 Programmable 8-bit timers, timer0 and timer1 - A cascade mode to create a 16-bit timer out of timer0 and timer1, - A Watchdog timer. \preserve\ The fixed clock divider is also used a baud rate generator for serial port control. IMG SRC = "smokey_wdog.jpg" "http://en.wikipedia.org/wiki/Watchdog_timer", More about Watchdog Timers CTRL 32

0xFFFC0000

Timer Control. A 32-bit write on register to control the operation, clock selection, and divide factor for timer 0 and timer 1. DIVIDE_0 31:24 R/W 0x00 DIV0 The divide factor between 1 and 256 for timer 0. "#0_DATA", See the WDOG_TIMER_0_DATA 8 bit Register DIVIDE_1 23:16 R/W 0x00 DIV1 The divide factor between 1 and 256 for timer 1. CLKSEL_0 15:12 R/W 0x0 CLK0 A set of 15 fixed clock frequency rates. The following enumerations describe the settings. This will be overwritten if the prescale bit is set for the corresponding timer. teTimerClkSel e0_3kHz 0 Nominal frequency = 0.3kHz e0_6kHz 1 Nominal frequency = 0.6kHz e1_2kHz 2 Nominal frequency = 1.2kHz e2_4kHz 3 Nominal frequency = 2.4kHz e4_8kHz 4 Nominal frequency = 4.8kHz e9_6kHz 5 Nominal frequency = 9.6kHz e19_2kHz 6 Nominal frequency = 19.2kHz e38_4kHz 7 Nominal frequency = 38.4kHz e57_6kHz 8 Nominal frequency = 57.6kHz e115_2kHz 9 Nominal frequency = 115_2kHz e230_4kHz 10 Nominal frequency = 230_4kHz e460_8kHz 11 Nominal frequency = 460_8kHz e921_6kHz 12 Nominal frequency = 921_6kHz e1843_2kHz 13 Nominal frequency = 1843_2kHz e6250_0kHz 14 Nominal frequency = 6250_0kHz eCascade0 15 Set Timer 1 only to this bit, sets up cascade mode name="clk_sel0" CLKSEL_1 11:8 R/W 0x0 CLK1 A set of 16 fixed clock prescale rates. To put the timers in cascade mode, set this bit to eCascade0. The timer0 interrupt is used to signal athe end count of the cascaded counter. The timer1 interrupt is not used. "#CTRL_CLKSEL_0", See the CLKSEL_0 Field PRESCALE_0 7:6 R/W 0x0 PRES0 Controls the prescaler for the timer 0. \preserve\ 0 = Normal 1 = Prescale clock 16 2 = Prescale clock 32 \preserve\ If this bit is set to 1 or 2, it will use the it's corresponding fixed clock select prescale value. It will override the clksel setting. PRESCALE_1 5:4 R/W 0x0 PRES1 Controls the prescaler for the timer 1. \preserve\ 0 = Normal 1 = Prescale clock 16 2 = Prescale clock 32 \preserve\ If this bit is set to 1 or 2, it will use the it's corresponding fixed clock select prescale value. It will override the clksel setting. INT_0 3 R/W1C 0x00 INT0 The Interrupt status of Timer 0. \preserve\ 0 = No Interrupt. 1 = Interrupt has occurred. \preserve\ Setting this bit to 0 has not effect. Setting it to 1 will clear the interrupt. INT_1 2 R/W1C 0x00 INT1 The Interrupt status of Timer 1. \preserve\ 0 = No Interrupt. 1 = Interrupt has occurred. \preserve\ Setting this bit to 0 has not effect. Setting it to 1 will clear the interrupt. MODE_0 1 R/W 0x00 MODE0 The timer 0 mode control. When the timer is started the following is performed: \preserve\ 1. Count down to 1. 2. Generate an interrupt and set the timer's interrupt bit 3. Restarts from the programmed divide factor. \preserve\ If the divide factor is changed while timer is running, it will not take effect until the ongoing count has expired. Valid Modes are 00,01,10, 11 = Reserved name="timer_mode0" teTimermode eTimerStopAndLoad b00 Stop the timer and load it witht the divide factor. eTimerStopAndPreserve b01 Stop the timer and preserve the current count value. eTimerRun b10 Start the timer as it is programmed. MODE_1 0 R/W 0x00 MODE1 The timer 1 mode control. "#timer_mode0", See Timer Mode 0 Description